Its a hard study because there are different versions of history. Even my professor taught it differently.
The way my professor taught it. There was only one Church, the Catholic Church which started with apostle Peter, then Christianity was allowed in Rome by Constantine. The Churches in the East rejected the Pope and had a Schism 1054.
The way I learned it myself:
There were East and West Churches simultaneously, with different theological, political, and hierarchal influences. There were 2 minor schisms, with the Nestorians (Hypostatic Union), and the Chalcedon (Not even sure what happened). As time grew the tensions of East and West grew, the concept of a Pope didn't fly with the East neither did some teachings so finally, they had a schism in 1054.
So the 4 major Churches from the 11th century, are Assyrian Church (Nestorians), Oriental Orthodox or Coptic Orthodox, Eastern Orthodox, and Catholicism.
https://www.amazon.com/First-Seven-Ecumenical-Councils-325-787/dp/0814656161
amazing book for understanding what shaped the early church and I would add written with no obvious bias. As informative as a history book but much more interesting to read.
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