Which council is known for the reaffirmation of the Nicene Creed?

The Council known for the reaffirmation of the Nicene Creed is the First Council of Nicaea. This council, convened in 325 AD, was significant because it established foundational Christian doctrine, particularly regarding the nature of Christ and his relationship to the Father. The Nicene Creed was formulated during this council to address and combat Arianism, which denied the full divinity of Jesus Christ.

The reaffirmation of the Nicene Creed was essential in unifying Christian belief and solidifying the concept of the Trinity as a central tenet of faith. This creed has been essential in subsequent ecumenical discussions and is viewed as a critical doctrinal statement in Christianity.

The other councils mentioned either occurred after the First Council of Nicaea or focused on different issues. For example, the Council of Ephesus addressed the nature of Christ and the Virgin Mary, while the Council of Chalcedon established the two natures of Christ. The Second Vatican Council primarily addressed the relationship of the Church with the modern world and did not focus on reaffirming the Nicene Creed.