October 8, 451 - Council of Chalcedon

As Christianity grew, the early church often settled issues of theology by meeting together in church councils. Many of these councils were held near the Mediterranean Sea for logistical purposes. On October 8, 451, the Council of Chalcedon (what is now Haydarpasa) met to settle the heretical teachings of the Eutychians. Eutychians did not believe Jesus was both God and man at the same time.