 The five patriarchs of the ancient Pentarchy (Rome, Constantinople, Alexandria, Antioch, and Jerusalem, in that order) are to be given seniority of honour, but have no actual power over other bishops other than the power of the synod they are chairing (and in which they also wield one vote).In 2007, the patriarch gave his approval to the Ravenna Document, a Catholic–Orthodox document re-asserting that the bishop of Rome is indeed the "prōtos" ("first") of the Church, as in "first among equals" and not supreme, although future discussions are to be held on the concrete ecclesiological exercise of papal primacy.According to "Lumen Gentium", the patriarch is a validly consecrated bishop in Roman ecclesiology, and there is merely an imperfect ecclesial communion between Constantinople and Rome, which exists nevertheless and which may be improved at some point in history.