The Second Council of Ephesus opens on…
August 449 CE
The Second Council of Ephesus opens on August 3, 449, convoked by Emperor Theodosius II without papal approval and chaired by Dioscorus, patriarch of Alexandria.
A Christological church synod commonly known as the Latrocinium (Robber Synod) of Ephesus, it is intended to be an ecumenical council, but because of the scandalous nature of the proceedings, canon legalities, and the heterodox nature of the canons and decrees as viewed by the orthodox bishops of East and West (and the later ecumenical councils), it will never be accepted as ecumenical.
The council defends Cyril's Alexandrian theology, deposes Theodoret and forces him into exile for a year.
Pope Leo’s “Tome,” however, is not read out at the synod, and the anathematized Eutyches, whose Monophysitist position that Christ had a single, divine nature the council upholds, is declared orthodox and rehabilitated; Flavian, patriarch of Constantinople, and Domnus II, patriarch of Antioch, are deposed on August 8.