Monothelitism
Monothelitism or monotheletism (from Greek μονοθελητισμός "doctrine of one will") is a particular teaching about how the divine and human relate in the person of Jesus, known as a Christological doctrine, that formally emerged in Armenia and Syria in 629. Specifically, monothelitism is the view that Jesus Christ has two natures but only one will. This is contrary to the Christology that Jesus Christ has two wills (human and divine) corresponding to his two natures (dyothelitism). Monothelitism is a development of the miaphysite or monophysite position in the Christological debates. Formulated in 638, it enjoyed considerable popularity, even garnering patriarchal support, before being rejected and denounced as heretical in 681 at the Third Council of Constantinople.
Background
During the 5th century, some regions of the Christian 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 was the Son of God, just what his exact nature was remained open to debate. The Church had declared the notion that Jesus was not fully divine heretical in the 4th century (see First Council of Nicaea), during the debates over Arianism and had declared that he was God the Son become human. However, as he was both God and man, there now emerged a dispute over exactly how the human and divine natures of Christ actually existed within the person of Christ.