When the proposed government of universal Christendom by five patriarchal sees (Rome, Constantinople, Alexandria, Antioch and Jerusalem, known as the pentarchy), under the auspices of a single universal empire, was formulated in the legislation of Emperor Justinian I (527-565), especially in his Novella 131, and received formal ecclesiastical sanction at the Council in Trullo (692), the name "patriarch" became the official one for the heads of major autocephalous churches, and the title of "exarch" was further demoted by naming all metropolitans as "patriarchal exarchs" in their ecclesiastical provinces. The advance of Constantinople put an end to privileges of three older, original exarchates, which fell back to the state of ordinary metropolitan sees.