Answer
Ruling for an impressive 48 years, Khosrow I, also known as Khosrow Anushirvan, reigned as the Shahanshah of the Sasanian Empire from 531 to 579 AD. His just rule and numerous accomplishments earned him the epithet "The Just." Khosrow I's reign marked a golden age for the Sasanian Empire, characterized by military victories, administrative reforms, cultural flourishing, and the establishment of a strong centralized government.