Robber Council

Pope Leo I referred to the Second Council of Ephesus as the “Robber Council” for allegedly taking action without proper representation from various factions and going too far in its repudiation of Nestorianism and imposing Monophysitism. Most Western churches do not acknowledge this as an ecumenical council while some Eastern churches do. Even though it is referred to as a Robber Council it was at least as legitimate as the Council of Chalcedon that repudiated its positions. See Second Council of Ephesus.