After the Coptic Church and orthodoxy (Catholic+Eastern Orthodox) had a schism, then they went their own way, but in 1442, a delegation of the Coptic Orthodox Church signed the Cantate Domino to join the Catholic Church.
The person referred to in this post is a head of a Catholic patriarchate. This Coptic Catholic Church is part of the Catholic Church
Thanks. This is more what I am looking for. I am not looking for arguments, but over the years I have kind of picked up a hobby of trying to figure what all these first millenial sects believed, and what separated them from other Christians at that time.
Do you know of any good books or web pages on these sects?