Revelation 6:14

And every mountain. In the dreadful confusion of the Roman empire, in the time of Constantine, so great was the revolution, that mountains appeared, as it were, moved out of their places; islands shifted from their accustomed situations. We behold at one time seven persons, Maximin Galerius, Maxentius, Severus Cæsar, Maximin, Alexander, Maximin Hercules, and Licinius, all aiming at the empire. The first six perished in nine years, from 305 to 314: Licinius was strangled in 324. All these were enemies of the Christian religion. Constantine, who supported it, remained sole master of the empire. (Calmet)