>> there is potentially a darker side to helena's journey. it follows on from a scandalous episode within the house of constantine. >> constantine abandoned his first wife to marry the noble woman fausta. fausta has given him three young sons, but her husband's likely successor is his eldest son, crispus. crispus was the golden boy of the constantinian household. he'd had a very successful military career. he'd been made caesar by his father. >> on the face of it, the christian family at the center of the roman empire are united, but a scandal is about to erupt.