Which Ecumenical Council dealt with the Maophysite controversy?

The Council of Chalcedon, held in 451 AD, is the ecumenical council that specifically addressed the Monophysite controversy, which revolved around the nature of Christ. This controversy stemmed from the teachings of Eutyches, who claimed that Christ had only one divine nature (monophysitism) and that his human nature was absorbed by the divine nature.

The council aimed to resolve the theological disagreements that resulted from this viewpoint and affirm the doctrine of Christ's dual nature as both fully divine and fully human, known as the hypostatic union. The Chalcedonian Definition, produced by this council, was crucial in articulating the orthodox Christian belief regarding the nature of Christ, thereby rejecting monophysitism and affirming that the two natures of Christ exist "without confusion, without change, without division, and without separation."

This decisive definition attempted to unify the Christian Church on this critical issue. This emphasis on Christ's dual nature is pivotal in understanding the theological landscape of Christianity and ultimately influenced various schisms and ecclesiastical relationships in the years that followed.