What doctrine did Monophysitism assert regarding Christ's nature?

Monophysitism is a Christological doctrine that asserts the belief that after the Incarnation, Christ has only a single, composite nature rather than two distinct natures. This doctrine holds that Jesus Christ is fully divine and fully human, but these two natures are united into one single nature that is primarily divine, in contrast to the dual natures doctrine held by mainstream Christianity, which maintains that Christ exists in two distinct natures—one divine and one human. Thus, Monophysitism emphasizes the oneness of Christ's nature, leading to the assertion that there was only one nature in Christ after the Incarnation. This belief resulted in significant theological debate and was a central issue in early Christian councils that sought to clarify the understanding of Christ's identity.