In 524 the Sassanid emperor Kavadh I approached Justin asking that he formally adopt his youngest son, Khosrow, in order to secure his succession over his elder, but less favoured, brothers. Justin was agreeable, but, aware that being childless himself an adopted Persian son would have a claim on the Byzantine throne, offered adoption according to barbarian custom. The Persians were insulted and broke off all negotiations. In 526, the Byzantines raided Persian Armenia at Justinian's initiative. Justinian was increasingly taking control of policy from his aging uncle. The raiding parties were led by two of Justinian's up-and-coming military protégees, Sittas and Belisarius. The raids achieved little, other than to make a statement of intent.