At which council was the hypostatic union prominently articulated?

The hypostatic union, which refers to the theological concept that in the person of Jesus Christ, two natures—divine and human—are united in one person without mixing or changing, was prominently articulated at the Council of Chalcedon in 451 AD. This council was crucial in defining Christological doctrine and addressing the various heresies that emerged regarding the nature of Christ.

At Chalcedon, the Council produced the Chalcedonian Definition, which articulated the belief that Jesus is fully God and fully man, emphasizing that these two natures exist in one person (hypostasis). This was a significant development in Christian theology because it provided a clear understanding of how Jesus could be both divine and human, which is foundational to Christian belief.

The other councils listed addressed different theological issues; for example, the Council of Ephesus dealt primarily with the nature of Mary as the Theotokos (God-bearer) and the heresy of Nestorianism, while the Council of Constantinople I affirmed the Nicene Creed and addressed the Arian controversy. The Council of Trent primarily focused on issues arising from the Protestant Reformation and dealt with reforms in Catholic doctrine and practice rather than Christological definitions. Each of these councils contributed to the