Monothelitism, or monotheletism (from monothelētismós), is a theological doctrine in Christianity, that holds Christ as having only one will. The doctrine is thus contrary to dyothelitism, a Christological doctrine that holds Christ as having two wills (divine and human). Historically, monothelitism was closely related to monoenergism, a theological doctrine that holds Jesus Christ as having only one Energeia/Nature. Both doctrines were at the center of Christological disputes during the 7th century. Theological notions related to the oneness of Christ's will emerged as a result of some earlier Christological controversies, that were related to monophysitism as formulated by Eutyches (d. 456), and miaphysitism as formulated by non-Chalcedonian followers of Cyril of Alexandria (d. 444). Since the notion of Christ's one nature implied the oneness of his will, ecclesiastical and political elites of the Eastern Roman Empire tried during the 7th century to promote monothelitism as a unifying doctrine that would reconcile divided Christian factions. In spite of strong imperial support, those attempts failed, and monothelitism was consequently rejected and denounced as heresy in 680–681 at the Third Council of Constantinople, the sixth ecumenical council. During the 5th century, some regions of the Church were thrown into confusion because of the debates that erupted over the nature of Jesus Christ. Although the Church had already determined that Christ is the son of God, his exact nature remained open to debate. The Church had declared heretical the notion that Jesus is not fully divine in the 4th century (see First Council of Nicaea), during the debates over Arianism and had declared that he is God the Son who became human. However, in arguing that he is both God and man, there now emerged a dispute over exactly how the human and divine natures of Christ actually exist within the person of Christ. The Christological definition of Chalcedon, as accepted by the Eastern Orthodox, Catholic, Anglican, Lutheran, and Reformed churches, is that Christ remains in two distinct natures, yet these two natures come together within his one hypostasis.