​FLAVIAN (d. 449), bishop of Constantinople, and an adherent of the Antiochene school, succeeded Proclus in 447. He presided at the council which deposed Eutyches (q.v.) in 448, but in the following year he was deposed by the council of Ephesus (the “robber synod”), which reinstated Eutyches in his office. Flavian’s death shortly afterwards was attributed, by a pious fiction, to ill treatment at the hands of his theological opponents. The council of Chalcedon canonized him as a martyr, and in the Latin Church he is commemorated on the 18th of February.