The see of Constantinople was elevated to a position of jurisdictional prominence not on the grounds of apostolic origin but because of its political importance as the capital of the Roman Empire. The First Council of Constantinople (381), held in what by then had been the political capital for half a century, decreed in a canon of disputed validity: "The Bishop of Constantinople, however, shall have the prerogative of honour after the Bishop of Rome; because Constantinople is New Rome." It was later ranked second among the sees in the theory of Pentarchy: "in the legislation of the emperor Justinian I (527–565), especially in his Novella 131, the theory received formal ecclesiastical sanction at the Council in Trullo (692), which ranked the five sees as Rome, Constantinople, Alexandria, Antioch, and Jerusalem."