"Latrocinium" of Ephesus
On August 8, 449 the Second Council of Ephesus began its first session with Dioscorus presiding by command of the Emperor. Dioscorus began the council by banning all members of the November 447 synod which had deposed Eutyches. He then introduced Eutyches who publicly professed that while Christ had two natures before the incarnation, the two natures had merged to form a single nature after the incarnation. Of the 130 assembled bishops, 111 voted to rehabilitate Eutyches. Throughout these proceedings, Roman legate Hilary repeatedly called for the reading of Leo's Tome, but was ignored. Dioscorus then moved to depose Flavian and Eusebius of Dorylaeum on the grounds that they taught the Word had been made flesh and not just assumed flesh from the Virgin and that Christ had two natures. When Flavian and Hilary objected, Dioscorus called for a pro-monophysite mob to enter the church and assault Flavian as he clung to the altar. Flavian was mortally wounded. Dioscorus then placed Eusebius of Dorylaeum under arrest and demanded the assembled bishops approve his actions. Fearing the mob, they all did. The papal legates refused to attend the second session at which several more orthodox bishops were deposed, including Ibas of Edessa, Irenaeus of Tyre (a close personal friend of Nestorius), Domnus of Antioch, and Theodoret. Dioscorus then pressed his advantage by having Cyril of Alexandria's Twelve Anathemas posthumously declared orthodox with the intent of condemning any confession other than one nature in Christ. Roman Legate Hilary, who as pope dedicated an oratory in the Lateran Basilica in thanks for his life, managed to escape from Constantinople and brought news of the Council to Leo who immediately dubbed it a "synod of robbers" — Latrocinium — and refused to accept its pronouncements. The decisions of this council now threatened schism between the East and the West.
Read more about this topic: Council Of Chalcedon