The Council of Chalcedon

Since the most religious bishops of Egypt have postponed for the present their subscription to the letter of the most holy Archbishop Leo, not because they oppose the Catholic Faith, but because they declare that it is the custom in the Egyptian diocese to do no such thing without the consent and order of their Archbishop, and ask to be excused until the ordination of the new bishop of the metropolis of Alexandria, it has seemed to us reasonable and kind that this concession should be made to them, they remaining in their official habit in the imperial city until the Archbishop of the Metropolis of Alexandria shall have been ordained.

And the most religious Bishop Paschasinus, representative of the Apostolic throne for Rome ], said:

If your authority suggests and commands that any indulgence be shown to them, let them give securities that they will not depart from this city until the city of Alexandria receives a Bishop.

And the most magnificent and glorious judges, and the whole Senate, said:

Let the sentence of the most holy Paschasinus be confirmed.

And therefore let them [i.e., the most religious Bishops of the Egyptians] remain in their official habit, either giving securities, if they can, or being bound by the obligation of an oath.