Note 036
Euseb. in Vit. Constantin. l. ii. c. 7, 8, 9. He introduces the Labarum before the Italian expedition- but his narrative seems to indicate that it was never shown at the head of an army, till Con-stantine, above ten years afterwards, declared himself the enemy of Licinius and the deliverer of the church
Note to Chapter 20 of DECLINE & FALL by Gibbon