It was rejected by the Oriental Orthodox churches, who held to Miaphysitism – however they too condemned the converse position of Monophyisitism as a heresy alongside the rest of mainstream Christianity.
Dyophysites believe that the two natures are completely and perfectly united in the one person and hypostasis of Jesus Christ,[4] in union with each other and co-existing without mixture, confusion or change.
"Dyophysitism was articulated in the Council of Chalcedon in 451,[9] which produced the Chalcedonian Definition, that states:[10] We confess that one and the same Christ, Lord, and only-begotten Son, is to be acknowledged in two natures without confusion, change, division or separation.
the distinction between the natures was never abolished by their union, but rather the character proper to each of the two natures was preserved as they came together in one person (prosopon) and one hypostasis.Nature (ousia) in the Chalcedonian sense can be understood to be referring to a set of "powers and qualities which constitute a being"[11] whereas person (prosopon) refers to "a concrete individual acting as subject in its own right.
It is now generally agreed that some of his ideas were not far from those that eventually emerged as orthodox, but the orthodoxy of his formulation of the doctrine of Christ is still controversial among churches.