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Justin I,c.450–527, Byzantine emperor (518–27); successor of Anastasius I. He was chief of the imperial guard and became emperor when Anastasius died. Justin persecuted the Monophysites and maintained close relations with the Western Church. An uneducated man, he entrusted the government largely to his nephew, who eventually succeeded him as Justinian IJustinian I
, 483–565, Byzantine emperor (527–65), nephew and successor of Justin I. He was responsible for much imperial policy during his uncle's reign. Soon after becoming emperor, Justinian instituted major administrative changes and tried to increase state
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See A. Vasiliev, Justin the First (1950).