Recently I've discovered some Catholic sources using this 'eastern' writer Theodore Abu-Qurrah (also written Abu Quarra)
"As for us, through the grace of the Holy Spirit, our sole goal is to build ourselves on the foundation of St. Peter, he who directed the six holy councils. These councils were gathered by command of the Bishop of Rome, the city of the world. Whoever sits on that city’s throne is authorized by Christ to have compassion on the people of the church, by summoning the ecumenical council, and to strengthen them, even as we have demonstrated in other places. We ask Christ to confirm us in this forever, that we might inherit through it his kingdom, in that we have joined with it the doing of his commandments. To him be praise, along with the Father and the Holy Spirit, forever and forever."
-From On the Death of Christ
Now I don't for one minute agree that all the councils were called for by the pope.
But I'm interested if anyone else has information on this writer.