Answer:
The Council of Chalcedon, is the right answer.
Explanation:
The Council of Chalcedon was a council of the church that was held in the period between 8th October to 1st November 451 at Chalcedon, in Asia Minor. This assembly was called off by Emperor Marcian to place beside the 449 Second Council of Ephesus. Its primary goal was to support the orthodox catholic dogma against the sin of Eutyches and the Monophysites, although ministerial moderation and administration also attended the attention of the council.
