Ardashir was the son of king Kavad II and Anzoy, who was a princess from the Byzantine Empire, which made Ardashir less popular among the Iranians, who had recently been in a long and devastating war against the Byzantines. In 628, a devastating plague spread through western Iran, which claimed the lives of half of the population, including Kavad II himself.
Reign
After the death of Kavad II, the Wuzurgan elected Ardashir as his successor, who was only a 7-year-old boy. In reality, however, he exercised little power and his empire was controlled by his vizierMah-Adhur Gushnasp, whose duty was to protect the empire until Ardashir became old enough to rule. The Iranian historian al-Tabari says the following thing about Mah-Adhur Gushnasp's administration of the Empire; "Mah-Adhur Gushnasp carried on the administration of the kingdom in an excellent fashion, firm conduct, no one would have been aware of Ardashir III's youthfulness." During the same period, a brother of Mah-Adhur Gushnasp named Narsi, was granted with Kashkar as a part of his domains, However, even under a strong vizier, things were still looking grim in Iran; Factionalism had greatly increased among the Iranians, and several powerful factions which had emerged during the reign of Ardashir's grandfather Khosrau II, had gained firm control of important parts of Iran, while the Sasanian state was less-centralized than it had been under Ardashir's predecessors. Ardashir's ascension was supported by both the Pahlav and Parsig faction, and a third major faction named the Nimruzi. However, sometime in 629, the Nimruzi withdrew their support for the shah, and started to conspire with the distinguished Iranian general Shahrbaraz to overthrow him. The Pahlav, under their leader Farrukh Hormizd of the Ispahbudhan clan, responded by supporting Ardashir's aunt Boran as the new ruler of Iran, who subsequently started minting coins in the Pahlav areas of Amol, Nishapur, Gurgan and Ray. One year later, Shahrbaraz with a force of 6,000 men marched towards Ctesiphon and besieged the city. Shahrbaraz, however, was unable to capture the city, and then made an alliance with Piruz Khosrow, the leader of the Parsig, and the previous minister of the Empire during the reign of Ardashir's father. With the support of both the Parsig and Nimruzi, Shahrbaraz captured Ctesiphon and executed Ardashir, Mah-Adhur Gushnasp himself, and many other prominent nobles. Shahrbaraz then ascended the Iranian throne. According to late folklore, Ardashir was buried at an unknown place in Meshan.
