Orientalium Ecclesiarum §7

⁷ The patriarchate, as an institution, has existed in the Church from the earliest times and was recognized by the first ecumenical councils. By the name Eastern patriarch, is meant the bishop to whom belongs jurisdiction over all bishops, not excepting metropolitans, clergy and people of his own territory or rite, in accordance with canon law and without prejudice to the primacy of the Roman Pontiff. Wherever a hierarch of any rite is appointed outside the territorial bounds of the patriarchate, he remains attached to the hierarchy of the patriarchate of that rite, in accordance with canon law.