Nope. That was one patriarch among several equals claiming a place above the others. Orthodox Christianity never had and still doesn't have one single head. (And a branch taking off is also two sides that get divided.)
It's the first time I hear that, frankly.
Well -- based on what you wrote so far, I am not surprised. Maybe I should tell you about the multiple Messsiahs and about Constantine's volte face someday. *Lunatic*, n. One whose delusions are out of fashion.
Mutually. A mutuaally consented divorce.
Do you have any proof, quotation or link to an authority calling the Catholic church a sect of the Orthodox ? Free at last! Free at last! Thank God Almighty, we are free at last! (Martin Luther King)