The East starting using the title “first among equals” in regards to the Pope after the Great Schism. Does any early church father use this exact phrase to describe the Bishop of Rome? No, but you certainly won’t be finding any early church father calling the Pope an infallible monarch bishop either. During the early structure of the Church, there were 5 ancient Patriarchates, with each having power in their own jurisdiction. That said, the Pope was given special honor and mention of “First” due to Rome being the seat of the Empire. In fact, the Great Schism is a direct result of the increasing and evolving power of the Papacy, a power that had not always existed. It also didn’t help that Rome used forged documents when trying to prove to the Orthodox that the Pope is more than a first among bishops. The Pope used the forged Pseudo-Isidorian Decretals when trying to impose his authority over the East. The Greek Orthodox even referred to Rome as being the “home of forgeries.”
The Papacy of the the early Church had nowhere near the power that the Pope of 1870 delcared himself of having. For example, take the history of the canon of scripture. The declaration of 2 Popes did not solve the issue of the canon of scripture. If the Pope was an infallible monarch bishop and was more than a first among equals, then why didn’t these declarations settle the matter?
catholicapologetics.org/ap030700.htm