In I, Constantius, we follow the life journey of a close advisor of Emperor Constantine I. A well-meaning cynic, Constantius considers Christianity to be just another religion amongst so many others, but with one difference: he is able to see how it can serve his master's political purposes. Ever sceptical of the proliferating superstitions of his day, Constantius nevertheless persuades the Emperor to make use of them. By unifying and then deploying the rising Christian religion, he helps Constantine to unite a fragmented empire and bring it under Constantine's control.