The Third Council of Ephesus, held in 431 AD, was an important gathering of Christian bishops convened to address the teachings of Nestorius, the Patriarch of Constantinople. The council aimed to resolve disputes regarding the nature of Christ and the title of Mary, specifically whether she should be called the "Mother of God" or "Mother of Christ." The council ultimately condemned Nestorius's views as heretical, affirming that Jesus is one person with two natures—divine and human. This decision reinforced the doctrine of the Hypostatic Union and solidified the role of Mary in Christian theology, leading to significant implications for the development of Christian doctrine.