Patriarch Photius I of Constantinople

“We may well ask who is the master who has taught you to act in this fashion? – surely, above all, it is Peter, the leaders of the Apostles whom the Lord has placed at the head of all the churches, when he said to him ‘Feed My sheep’. Nor is it only Peter, but also the holy synods and constitutions. And besides, it was the holy and orthodox decrees established by the fathers, as is clear from your divine and holy letters.” (Letter to John VIII, from Francis Dvornik’s Byzantium and the Roman Primacy, pg. 107-118).