@DoubleD
Which of these four is the oldest?
The only way any of those organizations were declared to exist as a distinct identity was by them being declared heretical by someone else, before that they and the group that declared them heretical were listed as part of the same group
But the Church of the East was the first to be identified as a distinct group because they were the first to be declared heretical out of the four I listed
All four grpups were declared heretical by at least one of the other four