Third Council of Constantinople, The Letter of Pope Agatho. Nicene and Post-Nicene Fathers, series 2, vol. 14 (Percival, 1900), public domain.
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- The Letter of Pope Agatho — Agatho a bishop and servant of the servants of God to the most devout and serene victors and conquerors, our most beloved sons and lovers of God and of our Lord Jesus Christ, the Emperor Constantine the Great, and to…vatican.va