Definition
Nestorianism is a Christian doctrine emphasizing the distinctness of the divine and human natures of Jesus Christ. Named after Nestorius, the Patriarch of Constantinople in the early 5th century, it holds that Mary should not be called 'Mother of God' (Theotokos) but rather 'Mother of Christ' (Christotokos), as she only bore Christ's human nature. The doctrine was condemned as heresy by the Council of Ephesus in 431 AD. It led to a schism within the early Church.