Final answer:
The Council of Ephesus took place in 431 AD and was organized to address the teachings of Nestorius. It affirmed that Jesus was one person with both human and divine natures.
Step-by-step explanation:
The Council of Ephesus took place in 431 AD. This council was an ecumenical council organized by the emperor Theodosius II and it gathered bishops from around the empire to settle matters of doctrine within the Christian Church.
The primary purpose of the Council of Ephesus was to address the teachings of Nestorius, who believed that Jesus was two separate persons - one human and one divine. The council declared Nestorius' teachings heretical and affirmed that Jesus was one person with both human and divine natures.