Eutychianism, also known as Real Monophysitism, is a set of Christian theological doctrines derived from the ideas of Eutyches of Constantinople (c. 380 – c. 456). Eutychianism is a monophysite understanding of how the human and divine relate within the person of Jesus Christ, with Christ being in one nature and of two, with the humanity of Christ subsumed by the divinity.
Eutychians were often labelled Phantasiasts by their adversaries, who accused their Christology of reducing Jesus' incarnation to a phantasm.
