Claim: Justinian I ruled the Byzantine Empire from 527 to 588.
Evidence: Justinian I -LRB- -LSB- dʒʌˈstɪniən -RSB- Flavius Petrus Sabbatius Iustinianus Augustus Φλάβιος Πέτρος Σαββάτιος Ἰουστινιανός Flávios Pétros Sabbátios Ioustinianós -RRB- -LRB- 482 14 November 565 -RRB- , traditionally known as Justinian the Great and also Saint Justinian the Great in the Eastern Orthodox Church , was a Byzantine -LRB- East Roman -RRB- emperor from 527 to 565.