Justinian IJus·tin·i·an I
(L. name Flavius Ancius Justinianus) 483-565; Byzantine emperor (527-565): known for the codification of Roman law (Justinian code): called the Great
Originally Flavius Petrus Sabbatius Justinianus. AD 483-565
Byzantine emperor (527-565) who held the eastern frontier of his empire against the Persians and reconquered former Roman territories in Africa, Italy, and Spain. He ruled jointly with his wife, Theodora.