THE ARIAN DEBATE
CONSTANTINE, being the imperial ruler of Britain and Gaul, and Maxentius, being the imperial ruler of Italy, Spain and Roman Africa, the two fell to fighting for undivided power. Down came Constantine out of Britain; in Gaul he reinforced his army; he crossed the Alps; at Verona he won a victory; and finally, at the Milvian Bridge over the Tiber, he found Maxentius holding the road to Rome. The soldiers of Constantine forced the soldiers of Maxentius back into the river, and Maxentius himself was drowned.
It was on his way to this decisive battle that Constantine was suddenly converted.
Our knowledge of the event comes mainly from Eusebius of Cæsarea, the preacher of the sermon at the consecration of the church in Tyre, who was informed by Constantine himself. On a day in October, 312, Constantine with his army was making his difficult way over the Alps. In the blaze of noon, "he saw with his own eyes," says Eusebius, "the trophy of a cross of light in the