
Usurper who killed Constans, committed suicide.
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Magnentius, a Roman general of barbarian origin, was proclaimed emperor by his troops in Gaul. He led a coup against Emperor Constans, who was killed while fleeing. This act divided the Roman Empire between Magnentius in the West and Constantius II in the East.
Magnentius fought a major battle against Constantius II at Mursa (modern Osijek, Croatia). The battle was one of the bloodiest in Roman history, with heavy losses on both sides. Magnentius was defeated, weakening his position and leading to his eventual downfall.
After retreating to Gaul, Magnentius was decisively defeated by Constantius II's forces at Mons Seleucus in southeastern Gaul. This defeat ended his rebellion. Magnentius fled to Lugdunum (Lyon) and committed suicide.
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