Edit: just before the battle of Milvian Bridge on the day before, October 27th, 312, the Emperor Constantine was given a sign in the heavens that would lead to his victory over the pagans and inaugurated a new age for the Church of cooperation with powers and principalities.
From the Epistle for the Feast of Christ the King:
(Col. 1:12-20) Brethren: Giving thanks to God the Father, who hath made us worthy to be partakers of the lot of the saints in light: Who hath delivered us from the power of darkness and hath translated us into the kingdom of the Son of his love, In whom we have redemption through his blood, the remission of sins: Who is the image of the invisible God, the firstborn of every creature: For in him were all things created in heaven and on earth, visible and invisible, whether thrones, or dominations, or principalities, or powers. All things were created by him and in him. And he is before all: and by him all things consist. And he is the head of the body, the church: who is the beginning, the firstborn from the dead, that in all things he may hold the primacy: Because in him, it hath well pleased the Father that all fullness should dwell: And through him to reconcile all things unto himself, making peace through the blood of his cross, both as to the things that are on earth and the things that are in heaven.Book recommendation, Helena by Evelyn Waugh.