Britannica Sources used in this answer

How did Emperor Justin I help Justinian I begin his political career?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Mosaic detail of Emperor Justinian I with a jeweled crown and halo, wearing ornate robes, from the Church of San Vitale in Ravenna, Italy. — Justinian I Justinian I, detail of a mosaic in the Church of San Vitale, Ravenna, Italy.

Emperor Justin I played a pivotal role in the rise of Justinian I, who was his nephew and favorite relative. Justinian’s political career began when he moved to Constantinople as a young man to join his uncle, who was then a high-ranking military commander.12

Justin I actively facilitated Justinian’s advancement by ensuring he received a Classical education and military training. Once Justin ascended the throne in 518, Justinian became a powerful influence in guiding the policies of his elderly and childless uncle. Justin I further solidified Justinian's position by legally adopting him and appointing him to important offices.123

The transition of power was formalized in 525 when Justin I bestowed the title of caesar upon his nephew. By April 527, Justinian was elevated to the rank of co-emperor, ensuring a smooth succession when Justin I died later that year on August 1, 527.12