Medallion on one side of the Arch of Constantine, c. 312-315 CE, Rome, Italy. With Constantine's conversion, Christian persecution ended and the development of Christendom began. Thus, the event celebrated by the Arch of Constantine was a major turning point in the history of the western world. (Holy Roman Empire)

Medallion on one side of the Arch of Constantine, c. 312-315 CE, Rome, Italy. With Constantine's conversion, Christian persecution ended and the development of Christendom began. Thus, the event celebrated by the Arch of Constantine was a major turning point in the history of the western world. (Holy Roman Empire)