The First Council of Nicaea, which was the first ecumenical council, was convened in 325 AD by the Roman Emperor Constantine I. The council was attended by hundreds of bishops, and its main purpose was to resolve the controversy surrounding the teachings of Arius, who had denied the divinity of Jesus Christ. The council produced the Nicene Creed, which affirmed the doctrine of the Trinity and established a clear statement of belief in the equality of the Father, Son, and Holy Spirit. Additionally, the council also established the date of Easter, among other important decisions.
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