Khosrow I, traditionally known by his epithet of Anushirvan, was the Sasanian King of Kings of Iran from 531 to 579. He was the son and successor of Kavad I.
Inheriting a reinvigorated empire at war with the Byzantines, Khosrow I made a peace treaty with them in 532, known as the Perpetual Peace, in which the Byzantine emperor Justinian I paid 11,000 pounds of gold to the Sasanians. Khosrow then focused on consolidating his power, executing conspirators, including his uncle Bawi. Dissatisfied with the actions of the Byzantine clients and vassals, the Ghassanids, and encouraged by the Ostrogoth envoys from Italy, Khosrow violated the peace treaty and declared war against the Byzantines in 540. He sacked the city of Antioch, bathed in the Mediterranean Sea at Seleucia Pieria, and held chariot races at Apamea where he made the Blue Faction—which was supported by Justinian—lose against the rival Greens. In 541, he invaded Lazica and made it an Iranian protectorate, thus initiating the Lazic War. In 545, the two empires agreed to halt the wars in Mesopotamia and Syria, while it waged on in Lazica. A truce was made in 557, and by 562 a Fifty-Year Peace Treaty was made.