Bishop and defender of the faith. He was born circa (c.) 250, probably in Alexandria, Egypt, becoming the bishop of the see in 313. The heresy of Arianism was sweeping the region, as Arius was preaching the doctrine there. Alexander excommunicated Arius in 321, a decision upheld by a council. Alexander is also credited with drawing up the acts of the First General Council of Nicaea in 325. He was described by contemporaries as “a lover of God . . .just . . . eloquent.” His successor, St Athanasius, was the choice of Alexander on his deathbed in 328. – Catholic Online
