197

By place

Roman Empire

• February 19 - Battle of Lugdunum: Emperor Septimius Severus defeats the self-proclaimed emperor Clodius Albinus at Lugdunum. Albinus commits suicide; legionaries sack the town.
• Septimius Severus returns to Rome and has about 30 of Albinus's supporters in the Senate executed. After his victory he declares himself the adopted son of the late Marcus Aurelius.
• Septimius Severus forms new naval units, manning all the triremes in Italy with heavily armed troops for war in the East. His soldiers embark on an artificial canal between the Tigris and Euphrates.
• Legio I, II, and III Parthica are levied by Septimius Severus for his Parthian campaign.
• The Roman army marches east to repel a Parthian invasion of Mesopotamia; they loot the royal palace at Ctesiphon and capture an enormous number of its inhabitants as slaves.
• Septimius Severus reconstitutes the Province of Mesopotamia under an equestrian governor commanding two legions.
• Septimius Severus, who had spared the Senate at the beginning of his reign, now excludes it from controlling the Roman empire by declaring a military dictatorship.

  Asia

• Battle of Wancheng: Zhang Xiu launches a surprise attack at Cao Cao.
• Yuan Shu declares himself emperor of the short-lived Zhong dynasty.
• Sansang becomes ruler of the Korean kingdom of Goguryeo.

  By topic

Arts and sciences

• Galen's major work on medicines, Pharmacologia, is published.

  Religion

• A Christian council is held in Edessa.