Historian - Jordanes - Gothic
Jordanes, himself a Goth, abridged a lost history of the Goths by Cassiodorus.
Jordanes is the main source of information on the Goths, but Michael Kulikowsky says he is unreliable, even if he is the only source on the origins of the Goths.
James J. O'Donnell published a book on the historian Cassiodorus in 1979 and in 1995 put the same on the Internet.
Section from Jordanes on the Visigoths and Ostrogoths
The Origin and Deeds of the Goths, translated by Charles C. Mierow.
Jordanes was probably a Christian bishop of Germanic origin, writing at Constantinople in 551 or 552 A. D. His Romana is the history of the world from a Roman point of view reviewing the facts concisely and leaving conclusions to the reader, and his Getica is an abridgement of Cassiodorus' (lost) Gothic History.