What was Nestorianism?

Nestorianism is a Christian theological doctrine associated with Nestorius, a 5th-century patriarch of Constantinople. It emphasizes a distinction between the divine and human natures of Jesus Christ, suggesting that they are separate and not fully united in one person. This belief led to significant controversy and was condemned as heretical at the Council of Ephesus in 431 AD, resulting in the establishment of the Church of the East, which continued to uphold Nestorian views. The term "Nestorian" is often used to describe this branch of Christianity and its teachings on Christology.