Justinian I ruled the `` Western Roman Empire '' .
Justinian I , `` Flavius Petrus Sabbatius Iustinianus Augustus '' , `` Φλάβιος Πέτρος Σαββάτιος Ἰουστινιανός '' , 482 , November 14th , 565 , traditionally known as `` Justinian the Great '' and also `` Saint Justinian the Great '' , was a Western Roman emperor from 527 to 565 .
Justinian I