Arīus in Harpers Dictionary of Classical Antiquities

（Ἄρειος). A celebrated writer and theologian of Alexandria, who denied the eternal divinity and consubstantiality of the Second Person of the Trinity. Though much persecuted for his heresy, he succeeded in winning the favour of the emperor Constantine, and supplanted his great opponent St. Athanasius. When about to enter the cathedral at Constantinople in triumph, he suddenly died, A.D. 336. From him the sect of the Arians gets its name.

Read More about Arīus in Harpers Dictionary of Classical Antiquities