Rome split from Alexandria, Antioch, Jerusalem, and Constantinople.
All of which are still part of my church.
IMO the protestant schisms are a bunch of angry Europeons being jealous of what the Pope did prior to the 1054 schism. Unilaterally changing doctrine.
That said the Pope's change was very very small, and he arguably at least had a good reason.
Protestants make absurd major changes on the whim of uneducated folks proclaiming themselves as personally as infailable as they aledge Romans hold the Post Vatican II Pope to be!
Evidently some very curious protestants have wandered overly close.
Sad. Sorry about that.