Robber Council of Ephesus
Held at Ephesus in 449, it was not really a council but a synod called to vindicate the heresiarch Eutyches from the condemnation of Saint Flavian, Patriarch of Constantinople.
Disgraceful scenes of violence occurred during one of the flrst sessions; Eutyches was vindicated, and Saint Flavian, and Theodoret, Bishop of Cyprus, were condemned without hearings.
Both appealed to Rome.
Pope Saint Leo excommunicated all who had taken part in the assembly and declared all its acts null.
New Catholic Dictionary