usurping Roman emperor of the West in AD 409–410, the first to be raised to that office by barbarians.

Attalus was born a pagan and was baptized by an Arian bishop. He was a senator at the time of Alaric's (Alaric) second siege of Rome, and he was named emperor of the West by the Goths after the city surrendered in 409. Attalus then urged the legitimate emperor, Honorius, to vacate his throne. Attalus soon alienated Alaric by his refusal to be merely the latter's puppet, however, and in 410 Alaric deposed the emperor whom he had himself elevated. Raised to the throne again in 414 by Ataulphus, Alaric's successor as chief of the Goths, Attalus was again deserted by his patrons and fell into the hands of Honorius, who exiled him to the island of Lipara.