Chalcedon
When and where
    451 AD in Calcedon (ancient seaport
of Bithynia on the sea
of Marmara)
Crisis or controversy
    Monophysites were teaching that Christ
had a single divine nature and
no human nature.
Attendees
    600 bishops;
    Convened: Marcianus, Emperor;
    Ratified: Leo I, Pope.
Decrees and resolutions
    Condemned Monophysitism;
    Declared that Christ had two distinct
natures and was both true
      God and true man;
    Promulgated canons of church discipline.
The  ecumenical council, at Chalcedon,
taught Jesus is true God and true man
(Painting by Vasili Ivanovich Surikov)