Nicene and Post-Nicene Fathers, Ser. II, Vol I:
The Life of Constantine with Orations of Constantine and Eusebius.: Chapter IV

Chapter IV.—That Constantine prepared himself for the War by Prayer: Licinius by the Practice of Divination.

He took with him also the priests of God, feeling well assured that now, if ever, he stood in need of the efficacy of prayer, and thinking it right that they should constantly be near and about his person, as most trusty guardians of the soul.

Now, as soon as the tyrant understood that Constantine’s victories over his enemies were secured to him by no other means than the cooperation of God, and that the persons above alluded to were continually with him and about his person; and besides this, that the symbol of the salutary passion preceded both the emperor himself and his whole army; he regarded these precautions with ridicule (as might be expected), at the same time mocking and reviling the emperor with blasphemous words.

On the other hand, he gathered round himself Egyptian diviners and soothsayers, with sorcerers and enchanters, and the priests and prophets of those whom he imagined to be gods. He then, after offering the sacrifices which he thought the occasion demanded, enquired how far he might reckon on a successful termination of the war. They replied with one voice, that he would unquestionably be victorious over his enemies, and triumphant in the war: and the oracles everywhere held out to him the same prospect in copious and elegant verses. The soothsayers certified him of favorable omens from the flight of birds; the priests 3164 declared the same to be indicated by the motion of the entrails of their victims. Elevated, therefore, by these fallacious assurances, he boldly advanced at the head of his army, and prepared for battle.

Footnotes

Soothsayers and priests. These were technically “augurs” and “haruspices.” Compare for their functions the articles Augur, Divinatio, and Haruspices, in Smith, Dict. Gr. and Rom. Ant.