An ecumenical council of the early Christian
church, convoked 451 by the Roman emperor
Marcian, and held at Chalcedon (now Kadikoy,
Turkey). The council, attended by over 500
bishops, resulted in the Definition of
Chalcedon, an agreed doctrine for both the
eastern and western churches. The council was
assembled to repudiate the ideas of Eutyches
(378-454) on Jesus' divine nature subsuming
the human; it also rejected the Monophysite
doctrine that Jesus had only one nature, and
repudiated Nestorianism. It reached a
compromise definition of Jesus' nature which
it was hoped would satisfy all factions:
Jesus was one person in two natures, united
`unconfusedly, unchangeably, indivisibly,
inseparably'.