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EUSEBIUS OF CAESAREA And while [the Emperor Constantine] was praying with fervent entreaty, a most marvelous sign appeared to him from heaven, which might have been hard to believe had it been related by anyone else. But since the victorious emperor himself long afterwards declared it to the writer of this history [Eusebius], when he was honored with his acquaintance and society, and confirmed his statement by an oath, who could fail to credit the story, especially since the testimony of subsequent time has established its truth? He said that at about noon, when the day was already beginning to decline, he saw a trophy of a cross of light in the heavens, above the sun, and bearing the inscription, βConquer by This.β He was struck with amazement, and his whole army also, which had followed him on this expedition and witnessed the miracle. He said [to me], moreover, that he did not know the meaning of this apparition. And while he continued to ponder and reason on it, night suddenly came on; then in his sleep the Christ of God appeared to him with the same sign he had seen in the heavens, and commanded him to make a likeness of that sign and to use it as a safeguard in all engagements with his enemies.Β .Β .Β . [B]eing struck with amazement at the extraordinary vision, and resolving to worship no other God save him who had appeared to him, he sent for those who were acquainted with the mysteries of [Godβs] doctrines and inquired who that God was and what was intended by the sign of the vision he had seen [Life of Constantine 1:28β32 (c. A.D. 337)].
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Jimmy Akin (The Fathers Know Best: Your Essential Guide to the Teachings of the Early Church)