Third Council of Constantinople, Letter of the Council to St. Agatho. Nicene and Post-Nicene Fathers, series 2, vol. 14 (Percival, 1900), public domain.
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- Letter of the Council to St. Agatho — A copy of the letter sent by the holy and Ecumenical Sixth Council to Agatho, the most blessed and most holy pope of Old Rome.vatican.va