In what year did the Council of Nicea condemn Arianism?

The Council of Nicea, which took place in 325 A.D., was significant in the history of Christian theology as it addressed the controversy surrounding Arianism. Arianism, named after the priest Arius, taught that Jesus Christ was a created being and not co-eternal with God the Father. This belief challenged the traditional understanding of the Trinity and the divinity of Christ.

At the council, the bishops ultimately condemned Arianism and affirmed the Nicene Creed, which articulated the belief in the co-equality and co-eternity of the Father, Son, and Holy Spirit. The decision made at Nicea was critical in shaping orthodox Christian doctrine and opposing heretical views. This historical context emphasizes the importance of the year 325 A.D. as it marked a foundational moment in the establishment of Christian beliefs regarding the nature of Christ and the relationship within the Trinity.