Monothelitism, or monotheletism (from ), 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 energy. 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.
Background
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. More simply, Christ is known as "both fully human and fully Divine, one in being with the Father". This position was opposed by the Monophysites who held that Christ possesses one nature only. The term Monophysitism of which Eutychianism is one type, held that the human and divine natures of Christ were fused into one new single (mono) nature. As described by Eutyches, his human nature was "dissolved like a drop of honey in the sea", and therefore his nature is really divine. This is distinct from Miaphysitism, which holds that, after the union, Christ is in one theanthropic (human-divine) nature and is generated from the union of two natures. The two are thus united without separation, without confusion, and without alteration, and with each having a particularity. Miaphysitism is the christological doctrine of the Oriental Orthodox churches.
Nevertheless, the resultant debates led the Chalcedonians to accuse the non-Chalcedonians of teaching Christ's humanity to be of a different kind from our own. Meanwhile, the non-Chalcedonians accused the Chalcedonians of espousing a form of Nestorianism, a rejected doctrine that held that Jesus Christ was two distinct subsistences.
This internal division was dangerous for the Byzantine Empire, which was under constant threat from external enemies, especially as many of the areas most likely to be lost to the empire were the regions that were in favour of Monophysitism, and who considered the religious hierarchy at Constantinople to be heretics only interested in crushing their faith. In these provinces, the non-Chalcedonians were far more numerous than the Chalcedonians. In Egypt for instance, some 30,000 Greeks of Chalcedonian persuasion were ranged against some five million Coptic non-Chalcedonians. Meanwhile, Syria and Mesopotamia were divided between Nestorianism and Jacobitism, while the religion of Armenia was wholly Cyrilline Non-Chalcedonian. Consequently, the Monothelite teaching emerged as a compromise position. The Byzantine emperor Heraclius tried to unite all of the various factions within the empire with this new formula that was more inclusive and more elastic.