296 CE

Pope Caius dies after a 13-year reign and is succeeded by Marcellinus as the 29th pope of Rome. Having supervised the Rhine frontier during Constantius' invasion of Britain, Maximian then marches into Spain, where he fights Frankish pirates. He then crosses into North Africa to contend with the rebellion of the Quinquegentiani. The Persian king Narseh invades Roman-held Upper Mesopotamia and Arsacid western Armenia, the latter territory being under the leadership of the pro-Roman king Tiridates III. With only a small army, Caesar Galerius fights three holding actions against Narseh's army in Mesopotamia. Somewhere in the open plains between Carrhae and Callinicum, Galerius' army suffers a defeat against the Persian army, which is both more numerous and contains superior numbers of high-quality cavalry. Nevertheless, Galerius succeeds in blunting the Persian offensive.