Canon 57

1. The erection, restoration, modification and suppression of

patriarchal Churches is reserved to the supreme authority of the

Church. 2. Only the supreme authority of the Church can modify the legitimately recognized or conceded title of each patriarchal Church. 3. If it is possible, a patriarchal Church must

have a permanent see for the residence of the patriarch in a

principal city inside its own territory from which the patriarch

takes his title; this see cannot be transferred except for a most

grave reason and with the consent of the synod of bishops of the

patriarchal Church and the assent of the Roman Pontiff.