In his not-very large book, entitled "When Our World Became Christian: 312 - 394", the French historian Mr. Paul Veyne told his readers the story of the takeover of power in the Roman state by the then-new Christian religion. The topic itself raised in the discussed study is extremely interesting and it is good that the author did his work diligently and expertly analyzed the historical sources available to him, telling us about incredibly turbulent times from Constantine to Theodosius - both called "The Great" by posterity.