Justinian I (483 -565) was Eastern Roman Emperor from 527 until his death. One of the most important rulers of Late Antiquity, he is best remembered for his reform of the legal code through the commission of Tribonian the military expansion of imperial territory that was achieved during his reign, primarily through the campaigns of Belisarius and his marriage and partnership with his wife Empress Theodora. He is also known as "The last Roman Emperor" and was the emperor who reconquered the city of Rome from the Ostrogoths.