Saint Cyril of Heliopolis, also known as Cyril of Heliopolis or Cyril of Jerusalem, was a 4th-century Christian bishop and theologian. He is particularly known for his theological writings and for his role at the Council of Nicaea in 325 AD.

Cyril was probably born around AD 313 in Jerusalem, although there is some uncertainty as to his exact birthplace. He was educated in the Christian faith and became priest of Jerusalem in 345, then was named bishop of the same city in 350.

Cyril is famous for his catechisms, notably the “Catechesis of Jerusalem”, a series of lectures intended for catechumens (people who were instructed in the Christian faith before their baptism). These catecheses are an important source for understanding Christian teaching and practice in the 4th century.

Additionally, Cyril played a crucial role at the Council of Nicaea in 325, where he was a leading defender of Christian orthodoxy against the Arian heresy, which denied the full divinity of Jesus Christ. He is credited with formulating part of the Nicene Creed, which affirmed the doctrine of the consubstantiality of the Son with the Father.

Saint Cyril of Heiliopolis is venerated as a saint in the Catholic Church and the Orthodox Church, and his feast day is celebrated on March 28.

By wbu4c

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