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 CXXXVI

Canon CXXXVI.  (Not numbered in the Greek but with a new heading.)

Here beginneth the letter of Atticus, bishop of Constantinople to the same.

To our holy lords, and rightly most blessed brethren and fellow bishops, Aurelius, Valentine, and 493 to the other beloved ones met together in the Synod held at Carthage, Atticus the bishop.

By our son Marcellus the subdeacon, I have received with all thanksgiving the writings of your holiness, praising the Lord that I enjoyed the blessing of so many of my brethren.  O my lords and most blessed brethren, ye have written asking me to send you most accurate copies of the canons enacted at the city of Nice, the metropolis of Bithynia, by the Fathers for the exposition of the faith.  And who is there that would deny to his brethren the common faith, or the statutes decreed by the Fathers.  Wherefore by the same son of mine, Marcellus, your subdeacon, who was in great haste, I have sent to you the canons in full as they were adopted by the Fathers in the city of Nice; and I ask of you that your holy synod would have me much in your prayers.  The subscription.  May our God keep your sanctity, as we desire, most holy brethren.

Footnotes

So in the Greek, vel in Latin.