Claudius II, full name Marcus Aurelius Claudius, surnamed Gothicus (AD 214-270), Roman Emperor, 268-70, born in Illyricum. He distinguished himself in military service and was made governor of his native province under Valerian. On the death of Gallienus, the army proclaimed Claudius emperor. He defeated the Alamanni in the north of Italy (268); and won a great victory over the Goths near Naissus, in Moesia, on which occasion he received his surname Gothicus. He died at Sirmium in Pannoni.