9 By the most ancient tradition of the Church the patriarchs of the Eastern Churches are to be accorded special honor, seeing that each is set over his patriarchate as father and head. This Sacred Council, therefore, determines that their rights and privileges should be re-established in accordance with the ancient tradition of each of the Churches and the decrees of the ecumenical councils. The rights and privileges in question are those that obtained in the time of union between East and West; though they should be adapted somewhat to modern conditions. The patriarchs with their synods are the highest authority for all business of the patriarchate, including the right of establishing new eparchies and of nominating bishops of their rite within the territorial bounds of the patriarchate, without prejudice to the inalienable right of the Roman Pontiff to intervene in individual cases.
Source: Orientalium Ecclesiarum (Vatican.va)