The Council of Ephesus was an important church assembly held in 431 AD in the city of Ephesus, located in present-day Turkey. It was convened by the Roman Emperor Theodosius II to address the growing controversy surrounding the nature of Christ and the role of the Virgin Mary. The council affirmed the title of Theotokos (God-bearer) for Mary, emphasizing her role as the mother of Jesus, who is both divine and human. The council also condemned the teachings of Nestorius, the Patriarch of Constantinople, who argued that Christ had two separate natures. The decisions made at the Council of Ephesus were significant in shaping Christian doctrine and solidifying the belief in the unity of Christ's divine and human natures.