Monophysitism (the belief that Jesus was completely divine with no admixture of humanity) was declared a heresy by _____?

The declaration of Monophysitism as a heresy is attributed to the Council of Chalcedon, which took place in 451 AD. This ecumenical council was convened to address various theological disputes within the Christian community, particularly regarding the nature of Jesus Christ.

At Chalcedon, church leaders articulated the doctrine of the hypostatic union, which affirmed that Jesus is one person with two distinct natures: one fully divine and one fully human. This was a direct response to the Monophysite belief that Christ's divine nature completely absorbed his human nature, leaving no genuine humanity. By formally rejecting Monophysitism, the Council of Chalcedon reinforced the belief that both natures coexist without confusion or division within the person of Jesus Christ.

The other councils mentioned do not address the specific heresy of Monophysitism. The Council of Nicaea primarily focused on the nature of Christ in relation to God the Father, particularly combating Arianism. The Diet of Worms was a central event in the Protestant Reformation that dealt with Martin Luther’s teachings rather than theological notions about Christ’s nature. The Council of Trent dealt with issues raised by the Protestant Reformation and was not focused on the