Athanasius of Alexandria

c. 296 – May 2, 373

Church Father & Defender of Trinitarian Doctrine

Athanasius contra mundum — Athanasius against the world

Biography

Bishop of Alexandria who spent most of his life fighting Arianism — the heresy that Christ was a created being. Exiled five times by four different emperors for his unwavering defense of Christ's full divinity.

Faith & Testimony

Athanasius stood virtually alone against the world (Athanasius contra mundum) in defending the Nicene Creed and the full deity of Christ. His work On the Incarnation remains a classic of Christian theology. C.S. Lewis wrote the introduction to a modern translation.

Sources

Athanasius — Wikipedia — Defender of Trinitarian orthodoxy
On the Incarnation — CCEL — Athanasius's classic work on why God became man, with a famous introduction by C.S. Lewis
Against the Arians (Orations) — New Advent — Athanasius's defense of Christ's full divinity against the Arian heresy