Nicene and Post-Nicene Fathers, Ser. II, Vol. XIV:
The Canons of the Synods of Sardica, Carthage, Constantinople, and Carthage Under St. Cyprian, Which Canons Were Received by the Council in Trullo and Ratified by II. Nice.: Canon CI

Canon CI.  (Greek civ. bis)

Of making peace between the Churches of Rome and Alexandria.

It seemed good that a letter be written to the holy Pope Innocent concerning the dissension between the Churches of Rome and Alexandria, so that each Church might keep peace with the other as the Lord commanded.

Notes.

Ancient Epitome of Canon CI.

It seemed good to write to Innocent that the Roman and Alexandrian churches might be at peace between themselves.

This canon is Canon vij. of Carthage, a.d. 407.