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- In 451, 115 years before Prophet Muhammad, several men representing various facets of Christianity met in Chalcedon in modern Turkey.
- They were discussing how to define the true nature of Christ. They believed he was divine, yet he lived and died like a man.
- 3 weeks later, they decided Jesus Christ had two natures in one: he was both God and man.
- Any Christians who deviated from this belief were declared heretics which immediately led to a schism in the Church
- While most Catholics and Eastern Orthodox Christians accepted the Chalcedon decree, Armenian, Ethiopian, and Coptic Christians did not.