Bastarnae


The Bastarnae were an ancient people who between 200 BC and 300 AD inhabited the region between the Carpathian Mountains and the river Dnieper, to the north and east of ancient Dacia. The Peucini, described as a branch of the Bastarnae by Greco-Roman writers, occupied the region north of the Danube Delta.
The ethno-linguistic affiliation of the Bastarnae was probably Celtic, which is supported by the earliest historians. However, later historical sources imply a Germanic or Scytho-Sarmatian origin. Often they are associated with the Germans, or the peoples "between the Celts and the Germans". The most likely scenario is that they were originally a Celtic tribe, originally resident in the lower Vistula River valley. Around 200 BC, these tribes migrated, possibly accompanied by some Germanic elements, south-eastwards into the North Pontic region. Some elements appear to have become assimilated, to some extent, by the surrounding Sarmatians by the 3rd century.
Although largely sedentary, some elements may have adopted a semi-nomadic lifestyle. So far, no archaeological sites have been conclusively attributed to the Bastarnae. The archaeological horizons most often associated by scholars with the Bastarnae are the Zarubintsy and Poienesti-Lukashevka cultures.
The Bastarnae first came into conflict with the Romans during the 1st century BC when, in alliance with Dacians and Sarmatians, they unsuccessfully resisted Roman expansion into Moesia and Pannonia. Later, they appear to have maintained friendly relations with the Roman Empire during the first two centuries AD. This changed c. 180, when the Bastarnae are recorded as participants in an invasion of Roman territory, once again in alliance with Sarmatian and Dacian elements. In the mid-3rd century, the Bastarnae were part of a Gothic-led grand coalition of lower Danube tribes that repeatedly invaded the Balkan provinces of the Roman Empire.
Many Bastarnae were resettled within the Roman Empire in the late 3rd century.

Ancient sources

According to Polybius :
"A mission from the Dardanians now arrived, telling of the Bastarnae, their numbers, the huge size and the valour of their warriors, and also pointing out that Perseus and the Galatians were in league with this tribe. They said they were much more afraid of him than of the Bastarnae, and they begged for aid."
According to Livy :
"The way to the Hadriatic and to Italy lay through the Scordisci; that was the only practicable route for an army, and the Scordisci were expected to grant a passage to the Bastarnae without any difficulty, for neither in speech nor habits were they dissimilar, and it was hoped that they would unite forces with them when they saw that they were going to secure the plunder of a very wealthy nation."
According to Strabo :
"However, it is clear from the "climata" and the parallel distances that if one travels longitudinally towards the east, one encounters the regions that are about the Borysthenes and that are to the north of the Pontus; but what is beyond Germany and what beyond the countries which are next after Germany — whether one should say the Bastarnae, as most writers suspect, or say that others lie in between, either the Iazyges, or the Roxolani, or certain other of the wagon-dwellers — it is not easy to say; nor yet whether they extend as far as the ocean along its entire length, or whether any part is uninhabitable by reason of the cold or other cause, or whether even a different race of people, succeeding the Germans, is situated between the sea and the eastern Germans. And this same ignorance prevails also in regard to the rest of the peoples that come next in order on the north; for I know neither the Bastarnae, nor the Sauromatae, nor, in a word, any of the peoples who dwell above the Pontus, nor how far distant they are from the Atlantic Sea, nor whether their countries border upon it."
According to Plutarch :
"He also secretly stirred up the Gauls settled along the Danube, who are called Basternae, an equestrian host and warlike; and he invited the Illyrians, through Genthius their king, to take part with him in the war. And a report prevailed that the Barbarians had been hired by him to pass through lower Gaul, along the coast of the Adriatic, and make an incursion into Italy."''
According to Tacitus :
"As to the tribes of the Peucini, Veneti, and Fenni I am in doubt whether I should class them with the Germans or the Sarmatæ, although indeed the Peucini called by some Bastarnæ, are like Germans in their language, mode of life, and in the permanence of their settlements. They all live in filth and sloth, and by the intermarriages of the chiefs they are becoming in some degree debased into a resemblance to the Sarmatæ."
According to Cassius Dio :
"During the same period in which these events occurred Marcus Crassus was sent into Macedonia and Greece and carried on war with the Dacians and Bastarnae. I have already stated who the former were and why they had become hostile; the Bastarnae, on the other hand, who are properly classed as Scythians, had at this time crossed the Ister and subdued the part of Moesia opposite them, and afterwards subdued the Triballi who adjoin this district and the Dardani who inhabit the Triballian country."
According to Zosismus :
"He likewise left in Thrace the Bastarnae, a Scythian people, who submitted to him, giving them land to inhabit there; on which account they observed the Roman laws and customs."

Etymology

The origin of the tribal name is uncertain. It is not even clear whether it was an exonym or an endonym. A related question is whether the groups denoted "Bastarnae" by the Romans considered themselves a distinct ethnic group at all or whether it was a generic exonym used by the Greco-Romans to denote a disparate group of tribes of the Carpathian region that could not be classified as Dacians or Sarmatians.
One possible derivation is from the proto-Germanic word *bastjan, meaning "binding" or "tie". In this case, Bastarnae may have had the original meaning of a coalition or bund of tribes.
It is possible that the Roman term basterna, denoting a type of wagon or litter, is derived from the name of this people who were known, like many Germanic tribes, to travel with a wagon train for their families.
It has also been suggested that the name is linked with the Germanic word bastard, meaning illegitimate or mongrel, but Batty considers this derivation unlikely. If the name is an endonym, then this derivation is unlikely, as most endonyms have flattering meanings.
Trubačev proposes a derivation from Old Persian, Avestan bast- "bound, tied; slave" and Iranian *arna- "offspring", equating it with the δουλόσποροι "slave Sporoi" mentioned by Nonnus and Cosmas, where the Sporoi are the people Procopius mentions as the ancestors of the Slavs.

Territory

The original homeland of the Bastarnae remains uncertain. Babeş and Shchukin argue in favour of an origin in eastern Pomerania on the Baltic coast of today's north-west Poland, on the grounds of correspondences in archaeological material, e.g. a Pomeranian-style fibula found in a Poieneşti site in Moldavia, although Batty considers the evidence insufficient. Babeş identifies the Sidoni, a branch of the Bastarnae which Strabo places north of the Danube delta with the Sidini located by Ptolemy in Pomerania.
Batty argues that Greco-Roman sources of the 1st century AD locate the Bastarnae homeland on the northern side of the Northern Carpathian mountain range, encompassing south-east Poland and south-west Ukraine. Pliny locates the Bastarnae between the Suebi and the Dacians. The Peutinger Map shows the Bastarnae north of the Carpathian mountains and appears to name the Galician Carpathians as the Alpes Bastarnicae.
From Galicia, the Bastarnae expanded into the Moldavia and Bessarabia regions, reaching the Danube Delta. Strabo describes the Bastarnae as inhabiting the territory "between the Ister and the Borysthenes ". He identifies three sub-tribes of the Bastarnae: the Atmoni, Sidoni and Peucini. The latter derived their name from Peuce, a large island in the Danube Delta which they had colonised. The 2nd-century geographer Ptolemy states that the Carpiani or Carpi separated the Peucini from the other Bastarnae "above Dacia".
It thus appears that the Bastarnae were settled in a vast arc stretching around the northern and eastern flanks of the Carpathians from south-east Poland to the Danube Delta. The larger group inhabited the northern and eastern slopes of the Carpathians and the region between the Prut and Dnieper rivers, while a separate group dwelt in and north of the Danube Delta region.

Ethno-linguistic affiliation

Scholars hold divergent theories about the ethnicity of the Bastarnae. One view, following what appears to be the most authoritative view among earliest scholars, is that they spoke a Celtic language. However others hold that they were Scythian/Germanic, or mixed Germanic/Sarmatian. A fringe theory is that they were Proto-Slavic. Shchukin argues that the ethnicity of the Bastarnae was unique and rather than trying to label the Bastanae as Celtic, Germanic or Sarmatian, it should be accepted that the "Basternae were the Basternae". Batty argues that assigning an "ethnicity" to the Bastarnae is meaningless; as in the context of the Iron Age Pontic-Danubian region, with its multiple overlapping peoples and languages, ethnicity was a very fluid concept: it could and did change rapidly and frequently, according to socio-political vicissitudes. This was especially true of the Bastarnae, who are attested over a relatively vast area.

Celtic

A leading reason to consider the Bastarnae as Celtic is that the regions they are documented to have occupied overlapped to a great extent with the locations of Celtic tribes attested in the northern Carpathians. In addition, archaeological cultures which some scholars have linked to the Bastarnae display pronounced Celtic affinities. Finally, the arrival of the Bastarnae in the Pontic-Danubian region, which can be dated to 233–216 BC according to two ancient sources, coincides with the latter phase of Celtic migration into the region.
The earliest historians give a Celtic or Gallic origin to the Bastarnae. Roman historian Livy, writing in c. 10 AD, attests that the Bastarnae spoke Celtic. Relating the Bastarnic invasion of the Balkans of 179 BC, he describes them then as "they were not very different in either language or manners" to the Celtic tribe of the Scordisci, a tribe of Pannonia. The Scordisci are described as Celtic by Strabo. The Greek historian Plutarch inform us that the Roman consul Hostilius "secretly stirred up the Gauls settled along the Danube, who are called Basternae".''
However, a Celtic identity for the Bastarnae is apparently contradicted by Polybius, who was an actual contemporary of the events described, unlike Livy, who was writing some 200 years later. Polybius clearly distinguishes the Bastarnae from the "Galatae" : "An embassy from the Dardani arrived , talking of the Bastarnae, their huge numbers, the strength and valour of their warriors, and also reporting that Perseus and the Galatae were in league with this tribe." In addition, inscription AE 14, recording a campaign on the Hungarian Plain by the Augustan-era general Marcus Vinucius, also appears to distinguish the Bastarnae from neighbouring Celtic tribes: "Marcus Vinucius... governor of Illyricum, the first to advance across the river Danube, defeated in battle and routed an army of Dacians and Basternae, and subjugated the Cotini, Osi,... and Anartii to the power of the emperor Augustus and of the people of Rome."
The three names of Bastarnae leaders found in ancient sources are of Celtic origin: Cotto, Clondicus and Teutagonus.

Germanic

Greco-Roman geographers of the 1st century AD are unanimous and specific that the Bastarnae were Germanic in language and culture. The Greek geographer Strabo says the Bastarnae are "of Germanic stock". The Roman geographer Pliny the Elder, classifies the Bastarnae and Peucini as being one of the five main subdivisions of Germanic peoples, the other subdivisions being three West Germanic groups, the Inguaeones, Istuaeones and Hermiones, and the East Germanic Vandili.
The Roman historian Tacitus describes the Bastarnae as Germans with substantial Sarmatian influence, but moves on to state: "The Peucini, however, who are sometimes called Bastarnae, are like the Germans in their language, way of life and types of dwelling."

Scytho-Sarmatian

Strabo includes the Roxolani, generally considered by scholars to have been a Sarmatian tribe, in a list of Bastarnae subgroups. However, this may simply be an error due to the close proximity of the two peoples north of the Danube Delta. In the 3rd century, the Greek historian Dio Cassius states that the "Bastarnae are properly classed as Scythians" and "members of the Scythian race". Likewise, the 6th-century historian Zosimus, reporting events around 280 AD, refers to "the Bastarnae, a Scythian people". However, it appears that these late Greco-Roman chroniclers used the term "Scythian" more often in a geographical sense rather than in an ethnic one. For example, Zosimus also routinely refers to the Goths, who were undoubtedly Germanic-speakers, as "Scythians".
It is possible that some Bastarnae may have been assimilated by the surrounding Sarmatians, perhaps adopting their tongue and customs. Thus Tacitus' comment that "mixed marriages are giving to some extent the vile appearance of the Sarmatians". On the other hand, the Bastarnae maintained a separate name until ca. 300 AD, probably implying retention of their distinctive ethno-linguistic heritage up to that time. It seems likely, on balance, that the core population of Bastarnae had always been, and continued to be, Germanic in language and culture.

Material culture

According to Malcolm Todd, traditional archaeology has not been able to construct a typology of Bastarnae material culture, and thus to ascribe particular archaeological sites to the Bastarnae. A complicating factor is that the regions where Bastarnae are attested contained a patchwork of peoples and cultures, some sedentary, some nomadic. In any event, post-1960s archaeological theory has questioned the validity of equating material "cultures", as defined by archaeologists, with distinct ethnic groups. In this view, it is impossible to attribute a "culture" to a particular ethnic group: it is likely that the material cultures discerned in the region belonged to several, if not all, of the groups inhabiting it. These cultures probably represent relatively large-scale socio-economic interactions between disparate communities of the broad region, possibly including mutually antagonistic groups.
It is not even certain whether the Bastarnae were sedentary, nomadic or semi-nomadic. Tacitus' statement that they were "German in their way of life and types of dwelling" implies a sedentary bias, but their close relations with the Sarmatians, who were nomadic, may indicate a more nomadic lifestyle for some Bastarnae, as does their attested wide geographical range. If the Bastarnae were nomadic, then the sedentary "cultures" identified by archaeologists in their lebensraum would not represent them. Nomadic peoples generally leave scant traces, due to the impermanent materials and foundations used in the construction of their dwellings.
Scholars have identified two closely related sedentary "cultures" as possible candidates to represent the Bastarnae as their locations broadly correspond to where ancient sources placed the Basternae: the Zarubintsy culture lying in the forest-steppe zone in northern Ukraine and southern Belarus, and the Poieneşti-Lukashevka culture in northern Moldavia. These cultures were characterised by agriculture, documented by numerous finds of sickles. Dwellings were either of surface or semi-subterranean types, with posts supporting the walls, a hearth in the middle and large conical pits located nearby. Some sites were defended by ditches and banks, structures thought to have been built to defend against nomadic tribes from the steppe. Inhabitants practiced cremation. Cremated remains were either placed in large, hand-made ceramic urns, or were placed in a large pit and surrounded by food and ornaments such as spiral bracelets and Middle to Late La Tène-type fibulae.
A major problem with associating the Poieneşti-Lukashevka and Zarubintsy cultures with the Bastarnae is that both cultures had disappeared by the early 1st century AD, while the Bastarnae continue to be attested in those regions throughout the Roman Principate. Another issue is that the Poieneşti-Lukashevka culture has also been attributed to the Costoboci, a people considered ethnically Dacian by mainstream scholarship, who inhabited northern Moldavia, according to Ptolemy. Indeed, Mircea Babeş and Silvia Theodor, the two Romanian archaeologists who identified Lukashevka as Bastarnic, nevertheless insisted that the majority of the population in the Lukashevka sphere was "Geto-Dacian". A further problem is that neither of these cultures were present in the Danube Delta region, where a major concentration of Bastarnae are attested by the ancient sources.
Starting in about 200 AD, the Chernyakhov culture became established in the modern-day western Ukraine and Moldova region inhabited by the Bastarnae. The culture is characterised by a high degree of sophistication in the production of metal and ceramic artefacts, as well as of uniformity over a vast area. Although this culture has conventionally been identified with the migration of the Gothic ethnos into the region from the northwest, Todd argues that its most important origin is Scytho-Sarmatian. Although the Goths certainly contributed to it, so probably did other peoples of the region such as the Dacians, proto-Slavs, Carpi and possibly the Bastarnae.

Relations with Rome

Roman Republican era (to 30 BC)

Allies of Philip of Macedon (179–8 BC)

The Bastarnae first appear in the historical record in 179 BC, when they crossed the Danube in a massive force. They did so at the invitation of their long-time ally, King Philip V of Macedon, a direct descendant of Antigonus, one of the Diadochi, the generals of Alexander the Great who had shared his empire after his death in 323 BC. The Macedonian king had suffered a disastrous defeat at the hands of the Romans in the Second Macedonian War, which had reduced him from a powerful Hellenistic monarch to the status of a petty client-king with a much-reduced territory and a tiny army. After nearly 20 years of slavish adherence to the Roman Senate's dictats, Philip had been goaded by the incessant and devastating raiding of the Dardani, a warlike Thraco-Illyrian tribe on his northern border, which his treaty-limited army was too small to counter effectively. Counting on the Bastarnae, with whom he had forged friendly relations, he plotted a strategy to deal with the Dardani and then to regain his lost territories in Greece and his political independence. First, he would unleash the Bastarnae against the Dardani. After the latter had been crushed, Philip planned to settle Bastarnae families in Dardania to ensure that the region was permanently subdued. In a second phase, Philip aimed to launch the Bastarnae on an invasion of Italy via the Adriatic coast. Although he was aware that the Bastarnae were likely to be defeated, Philip hoped that the Romans would be distracted long enough to allow him to reoccupy his former possessions in Greece.
However, Philip, now 60 years of age, died before the Bastarnae could arrive. The Bastarnae host was still en route through Thrace, where it became embroiled in hostilities with the locals, who had not provided them with sufficient food at affordable prices as they marched through. Probably in the vicinity of Philippopolis, the Bastarnae broke out of their marching columns and pillaged the land far and wide. The terrified local Thracians took refuge with their families and animal herds on the slopes of Mons Donuca, the highest mountain in Thrace. A large force of Bastarnae chased them up the mountain, but were driven back and scattered by a massive hailstorm. Then the Thracians ambushed them, turning their descent into a panic-stricken rout. Back at their wagon fort in the plain, around half of the demoralised Bastarnae decided to return home, leaving c. 30,000 to press on to Macedonia.
Philip's son and successor Perseus, while protesting his loyalty to Rome, deployed his Bastarnae guests in winter quarters in a valley in Dardania, presumably as a prelude to a campaign against the Dardani the following summer. However, in the depths of winter their camp was attacked by the Dardani. The Bastarnae easily beat off the attackers, chased them back to their chief town and besieged them, but they were surprised in the rear by a second force of Dardani, which had approached their camp stealthily by mountain paths, and proceeded to storm and ransack it. Having lost their entire baggage and supplies, the Bastarnae were obliged to withdraw from Dardania and to return home. Most perished as they crossed the frozen Danube on foot, only for the ice to give way. Despite the failure of Philip's Bastarnae strategy, the suspicion aroused by these events in the Roman Senate, which had been warned by the Dardani of the Bastarnae invasion, ensured the demise of Macedonia as an independent state. Rome declared war on Perseus in 171 BC and after the Macedonian army was crushed at the Battle of Pydna, Macedonia was split up into four Roman puppet-cantons. Twenty-one years later, these were in turn abolished and annexed to the Roman Republic as the province of Macedonia.

Allies of Getan high king Burebista (62 BC)

The Bastarnae first came into direct conflict with Rome as a result of expansion into the lower Danube region by the proconsuls of Macedonia in 75–72 BC. Gaius Scribonius Curio campaigned successfully against the Dardani and the Moesi, becoming the first Roman general to reach the Danube with his army. His successor, Marcus Licinius Lucullus, campaigned against the Thracian Bessi tribe and the Moesi, ravaging the whole of Moesia, the region between the Haemus mountain range and the Danube. In 72 BC, his troops occupied the Greek coastal cities of Scythia Minor, which had sided with Rome's Hellenistic arch-enemy, King Mithridates VI of Pontus, in the Third Mithridatic War.
The presence of Roman forces in the Danube Delta was seen as a major threat by all the neighbouring transdanubian peoples: the Peucini Bastarnae, the Sarmatians and, most importantly, by Burebista, king of the Getae. The Getae occupied the region today called Wallachia as well as Scythia Minor and were either a Dacian- or Thracian- speaking people. Burebista had unified the Getae tribes into a single kingdom, for which the Greek cities were vital trade outlets. In addition, he had established his hegemony over neighbouring Sarmatian and Bastarnae tribes. At its peak, the Getae kingdom reportedly was able to muster 200,000 warriors. Burebista led his transdanubian coalition in a struggle against Roman encroachment, conducting many raids against Roman allies in Moesia and Thrace, penetrating as far as Macedonia and Illyria.
The coalition's main chance came in 62 BC, when the Greek cities rebelled against Roman rule. In 61 BC, the notoriously oppressive and militarily incompetent proconsul of Macedonia, Gaius Antonius, nicknamed Hybrida, an uncle of the famous Mark Antony, led an army against the Greek cities. As his army approached Histria, Antonius detached his entire mounted force from the marching column and led it away on a lengthy excursion, leaving his infantry without cavalry cover, a tactic he had already used with disastrous results against the Dardani. Dio implies that he did so out of cowardice, in order to avoid the imminent clash with the opposition, but it is more likely that he was pursuing a large enemy cavalry force, probably Sarmatians. A Bastarnae host, which had crossed the Danube to assist the Histrians, promptly attacked, surrounded and massacred the Roman infantry, capturing several of their vexilla. This battle resulted in the collapse of the Roman position on the lower Danube. Burebista apparently annexed the Greek cities. At the same time, the subjugated "allied" tribes of Moesia and Thrace evidently repudiated their treaties with Rome, as they had to be reconquered by Augustus in 29–8 BC.
In 44 BC, Roman dictator-for-life Julius Caesar planned to lead a major campaign to crush Burebista and his allies once and for all, but he was assassinated before it could start. However, the campaign was made redundant by Burebista's overthrow and death in the same year, after which his Getae empire fragmented into four, later five, independent petty kingdoms. These were militarily far weaker, as Strabo assessed their combined military potential at just 40,000 armed men, and were often involved in internecine warfare. The Geto-Dacians did not again become a threat to Roman hegemony in the lower Danube until the rise of Decebal 130 years later.

Roman Principate (30 BC – 284 AD)

Augustan era (30 BC – 14 AD)

Once he had established himself as sole ruler of the Roman state in 30 BC, Caesar's grand-nephew and adopted son Augustus inaugurated a strategy of advancing the empire's south-eastern European border to the line of the Danube from the Alps, the Dinaric Alps and Macedonia. The primary objective was to increase strategic depth between the border and Italy and also to provide a major fluvial supply route between the Roman armies in the region.
On the lower Danube, which was given priority over the upper Danube, this required the annexation of Moesia. The Romans' target was thus the tribes which inhabited Moesia, namely the Triballi, Moesi and those Getae who dwelt south of the Danube. The Bastarnae were also a target because they had recently subjugated the Triballi, whose territory lay on the southern bank of the Danube between the tributary rivers Utus and Ciabrus, with their chief town at Oescus. In addition, Augustus wanted to avenge the defeat of Gaius Antonius at Histria 32 years before and to recover the lost military standards. These were held in a powerful fortress called Genucla, controlled by Zyraxes, the local Getan king. The man selected for the task was Marcus Licinius Crassus, grandson of Crassus the triumvir and an experienced general at 33 years of age, who was appointed proconsul of Macedonia in 29 BC.
The Bastarnae provided the casus belli by crossing the Haemus and attacking the Dentheletae, a Thracian tribe who were Roman allies. Crassus marched to the Dentheletae's assistance, but the Bastarnae host hastily withdrew over the Haemus at his approach. Crassus followed them closely into Moesia but they would not be drawn into battle, withdrawing beyond the Tsibritsa. Crassus now turned his attention to the Moesi, his prime target. After a successful campaign which resulted in the submission of a substantial section of the Moesi, Crassus again sought out the Bastarnae. Discovering their location from some peace envoys they had sent to him, he lured them into battle near the Tsibritsa by a stratagem. Hiding his main body of troops in a wood, he stationed as bait a smaller vanguard in open ground before the wood. As expected, the Bastarnae attacked the vanguard in force, only to find themselves entangled in the full-scale pitched battle with the Romans that they had tried to avoid. The Bastarnae tried to retreat into the forest but were hampered by the wagon train carrying their women and children, as these could not move through the trees. Trapped into fighting to save their families, the Bastarnae were routed. Crassus personally killed their king, Deldo, in combat, a feat which qualified him for Rome's highest military honour, spolia opima, but Augustus refused to award it on a technicality. Thousands of fleeing Bastarnae perished, many asphyxiated in nearby woods by encircling fires set by the Romans, others drowned trying to swim across the Danube. Nevertheless, a substantial force dug themselves into a powerful hillfort. Crassus laid siege to fort, but had to enlist the assistance of Rholes, a Getan petty king, to dislodge them, for which service Rholes was granted the title of socius et amicus populi Romani.
The following year, Crassus marched on Genucla. Zyraxes escaped with his treasure and fled over the Danube into Scythia to seek aid from the Bastarnae. Before he was able to bring reinforcements, Genucla fell to a combined land and fluvial assault by the Romans. The strategic result of Crassus' campaigns was the permanent annexation of Moesia by Rome.
About a decade later, in 10 BC, the Bastarnae again clashed with Rome during Augustus' conquest of Pannonia. Inscription AE 14 records a campaign on the Hungarian Plain by the Augustan-era general Marcus Vinucius:
Marcus Vinucius..., Consul ..., governor of Illyricum, the first to advance across the river Danube, defeated in battle and routed an army of Dacians and Basternae, and subjugated the Cotini, Osi,... and Anartii to the power of the emperor Augustus and of the people of Rome.
Most likely, the Bastarnae, in alliance with Dacians, were attempting to assist the hard-pressed Illyrian/Celtic tribes of Pannonia in their resistance to Rome.

1st and 2nd centuries

It appears that in the final years of Augustus' rule, the Bastarnae made their peace with Rome. The Res Gestae Divi Augusti, an inscription commissioned by Augustus to list his achievements, states that he received an embassy from the Bastarnae seeking a treaty of friendship. It appears that a treaty was concluded and apparently proved remarkably effective, as no hostilities with the Bastarnae are recorded in surviving ancient sources until c. 175, some 160 years after Augustus' inscription was carved. But surviving evidence for the history of this period is so thin that it cannot be excluded that the Bastarnae clashed with Rome during it. The Bastarnae may have been involved in the Dacian Wars of Domitian and Trajan, since these took place in the lower Danube region and it is known that both sides were supported by neighbouring indigenous tribes.
In the late 2nd century, the Historia Augusta mentions that in the rule of Marcus Aurelius, an alliance of lower Danube tribes including the Bastarnae, the Sarmatian Roxolani and the Costoboci took advantage of the emperor's difficulties on the upper Danube to invade Roman territory.

3rd century

During the late 2nd century, the main ethnic change in the northern Black Sea region was the immigration, from the Vistula valley in the North, of the Goths and accompanying Germanic tribes such as the Taifali and the Hasdingi, a branch of the Vandal people. This migration was part of a series of major population movements in the European barbaricum. The Goths appear to have established a loose political hegemony over the existing tribes in the region.
Under the leadership of the Goths, a series of major invasions of the Roman empire were launched by a grand coalition of lower Danubian tribes from c. 238 onwards. The participation of the Bastarnae in these is likely but largely unspecified, due to Zosimus' and other chroniclers' tendency to lump all these tribes under the general term "Scythians" – meaning all the inhabitants of Scythia, rather than the specific Iranic-speaking people called the Scythians. Thus, in 250–251, the Bastarnae were probably involved in the Gothic and Sarmatian invasions which culminated in the Roman defeat at the Battle of Abrittus and the slaying of Emperor Decius. This disaster was the start of the Third Century Crisis of the Roman Empire, a period of military and economic chaos. At this critical moment, the Roman army was crippled by the outbreak of a second smallpox pandemic, the plague of Cyprian. The effects are described by Zosimus as even worse than the earlier Antonine plague, which probably killed 15–30% of the empire's inhabitants.
Taking advantage of Roman military disarray, a vast number of barbarian peoples overran much of the empire. The Sarmato-Gothic alliance of the lower Danube carried out major invasions of the Balkans region in 252, and in the periods 253–258 and 260–268. The Peucini Bastarnae are specifically mentioned in the 267/268 invasion, when the coalition built a fleet in the estuary of the river Tyras. The Peucini Bastarnae would have been critical to this venture since, as coastal and delta dwellers, they would have had seafaring experience that the nomadic Sarmatians and Goths lacked. The barbarians sailed along the Black Sea coast to Tomis in Moesia Inferior, which they tried to take by assault without success. They then attacked the provincial capital Marcianopolis, also in vain. Sailing on through the Bosporus, the expedition laid siege to Thessalonica in Macedonia. Driven off by Roman forces, the coalition host moved overland into Thracia, where finally it was crushed by Emperor Claudius II at Naissus.
Claudius II was the first of a sequence of military emperors who restored order in the empire in the late 3rd century. These emperors followed a policy of large-scale resettlement within the empire of defeated barbarian tribes, granting them land in return for an obligation of military service much heavier than the usual conscription quota. The policy had the triple benefit, from the Roman point of view, of weakening the hostile tribe, repopulating the plague-ravaged frontier provinces and providing a pool of first-rate recruits for the army. It could also be popular with the barbarian prisoners, who were often delighted by the prospect of a land grant within the empire. In the 4th century, such communities were known as laeti.
The emperor Probus is recorded as resettling 100,000 Bastarnae in Moesia, in addition to other peoples, including Goths, Gepids and Vandals. The Bastarnae are reported to have honoured their oath of allegiance to the emperor, while the other resettled peoples mutinied while Probus was distracted by usurpation attempts and ravaged the Danubian provinces far and wide. A further massive transfer of Bastarnae was carried out by Emperor Diocletian after he and his colleague Galerius defeated a coalition of Bastarnae and Carpi in 299.

Later Roman empire (305 onwards)

The remaining transdanubian Bastarnae disappear into historical obscurity in the late empire. Neither of the main ancient sources for this period, Ammianus Marcellinus and Zosimus, mention the Bastarnae in their accounts of the 4th century, possibly implying the loss of their separate identity, presumably assimilated by the regional hegemons, the Goths. Such assimilation would have been facilitated if, as is possible, the Bastarnae spoke an East Germanic language closely related to Gothic. If the Bastarnae remained an identifiable group, it is highly likely that they participated in the vast Gothic-led migration, driven by Hunnic pressure, that was admitted into Moesia by Emperor Valens in 376 and eventually defeated and killed Valens at Adrianople in 378. Although Ammianus refers to the migrants collectively as "Goths", he states that, in addition, "Taifali and other tribes" were involved.
However, after a gap of 150 years, there is a final mention of Bastarnae in the mid-5th century. In 451, the Hunnic leader Attila invaded Gaul with a large army which was ultimately routed at the Battle of Châlons by a Roman-led coalition under the general Aetius. Attila's host, according to Jordanes, included contingents from the "innumerable tribes that had been brought under his sway". This included the Bastarnae, according to the Gallic nobleman Sidonius Apollinaris. However, E.A. Thompson argues that Sidonius' mention of Bastarnae at Chalons is probably false: his purpose was to write a panegyric and not a history, and Sidonius added some spurious names to the list of real participants for dramatic effect.

Ancient