Non-Chalcedonianism is a religious doctrine of those Christian churches that do not accept the Confession of Chalcedon as defined at the ecumenical of Council of Chalcedon in 451. The doctrine contrasts with Chalcedonian Christianity, which accepts the doctrines of the first seven Ecumenical Councils. Some Christian denominations do not accept the Confession of Chalcedon, for varying reasons, but accept the doctrines of the previous council at the Council of Ephesus in 431.