The election of a new Coptic Pope is a good reminder that Rome isn't the only ancient church claiming to be the one true church. (link) Rome and Alexandria split over a bit of theology that would by today's standards look trivial. Same with Rome and the East. Makes you wonder, did they take theology more seriously back then? Or were the theological issues only the pretext and the political autonomy was the real goal? Probably both. In any case, the ancient church was not perfectly united in the idea that the Pope in Rome was the boss.