This paper focuses on the subject of conversion in Hrotsvitha of Gandersheim\u2019s dramatic plays (or \uabdramatic dialogues\ubb) and, chiefly, in the first of them, the Gallicanus. The play is divided in two parts and is entirely founded on hagiograhical sources, regarding some episodes about the conversion of Gallican, emperor Constantine\u2019s commander-in-chief (BHL 3236: Conversio Gallicani principis militiae), and the martyrdom of primicerii John and Paul (BHL 3242: Passio martyrum Iohannis et Pauli). Through a strict analysis of Hrotsvitha\u2019s play\u2019s matter, can be highlighted the different typologies of the conversion\u2019s theme, which involves a spiritual renovation, and the treatment of dramatic plot in the figures of the leading role Gallican, his daughters Attica and Artemia, and the \uabvillain\ubb Terentian. In every way, through the narration of these episodes, Hrotsvitha aims to show the great power of God in this world