Eutychianism

Eutychianism is a religious doctrine that emerged in the 4th–5th century, founded by the monk Eutyches. It is a form of monophysitism, which asserts that Christ had only one nature. Eutyches believed that the divine and human in Christ blended so completely that only one nature remained, effectively subsuming the human nature into the divine. This view was in opposition to the doctrine of two distinct natures in Christ, which was later affirmed by the Council of Chalcedon in 451. Consequently, Eutychianism is considered heretical by both Roman Catholicism and Eastern Orthodoxy.1234