The Canons of the Councils of Ancyra, Gangra, Neocæsarea, Antioch and Laodicea, which Canons were Accepted and Received by the Ecumenical Synods 86Canon XXIII.

It shall not be lawful for a bishop, even at the close of life, to appoint another as successor to himself; and if any such thing should be done, the appointment shall be void. But the ecclesiastical law must be observed, that a bishop must not be appointed otherwise than by a synod and with the judgment of the bishops, who have the authority to promote the man who is worthy, after the falling asleep of him who has ceased from his labours.