 There al-Nu'man provided Bahram with teachers from the Sasanian court, where Bahram was taught law, archery, and equestrian arts.Since the death of the powerful Sasanian shah Shapur II (r. 309–379), the aristocrats and priests had expanded their influence and authority at the cost of the Sasanian government, nominating, dethroning, and murdering shahs, which included Yazdegerd I, who was murdered in 21 January 420.They now sought to stop the sons of Yazdegerd I from the ascending the throne—Shapur IV, who was the eldest son of Yazdegerd I and governor of Armenia, quickly rushed to the Sasanian capital of Ctesiphon, and ascended the throne.