 The form of address that Jordanes uses and his admonition that Vigilius ""turn to God"" would seem to rule out this identification.In the preface to his "Getica", Jordanes writes that he is interrupting his work on the "Romana" at the behest of a brother Castalius, who apparently knew that Jordanes possessed the twelve volumes of the History of the Goths by Cassiodorus.Castalius wanted a short book about the subject, and Jordanes obliged with an excerpt based on memory, possibly supplemented with other material to which he had access.