died 373
Athanasius (c. 296-373 AD) was a Christian theologian and bishop of Alexandria, known for his crucial role in the development of Christian doctrine, particularly regarding the nature of Christ and the Trinity. He was a staunch opponent of Arianism, which denied the full divinity of Jesus, and is best known for his work "On the Incarnation" and for being a key figure at the Council of Nicaea in 325 AD. Athanasius is recognized as a Doctor of the Church and is venerated as a saint in both Eastern and Western Christianity.