What did monophysitism teach about Christ's nature?

Monophysitism is a Christological doctrine asserting that Jesus Christ possesses only one nature, rather than the two distinct natures—divine and human—defined by the Council of Chalcedon in 451.12

Proponents of this view, most notably the monk Eutyches, argued that after the Incarnation, Christ’s human nature was deified and subsumed into his divine essence. Consequently, this teaching held that Christ’s nature was altogether divine and not of the same substance as that of other human beings.312

While the term "monophysite" was historically used to label those who rejected the Chalcedonian definition, many of these groups—now known as the Oriental Orthodox churches—prefer the term miaphysite. They emphasize that both divinity and humanity are present within a single, unified nature in the person of Christ, a position that modern theological dialogue has increasingly recognized as distinct from the extreme views originally condemned as heretical.1