history. >> her influence upon her son constantine will change the fate of the roman empire and the fate of christianity. >> a decade after her death, her son constantine, now an old man, falls ill. after a lifetime of championing the cause of christianity, he takes the final step and asks to be baptized. >> there was so much of constantine's life that didn't lineup with being a christian. he killed so many people and he was just a violent man. but something i believe changed in the last year of his life. i think he had a full conversion.