 In the 6th century, the official title became that of "archbishop of Constantinople, New Rome, and ecumenical patriarch".The current patriarch (since 1991) is Bartholomew I who has become better-known than any of his predecessors in modern times as a result of his numerous pastoral and other visits to numerous countries in five continents and his setting up of a permanent bureau at the EU headquarters, in addition to enhancing the long-established Patriarchal Centre in Pregny-Chambésy, Switzerland, and also his ecological pursuits which have won him the epithet of "the Green Patriarch".When the Ottoman Turks conquered Constantinople in 1453, the patriarchate ceased to function.