People - Ancient Rome : Magnus Maximus
Magnus Maximus (ca. 335–August 28, 388), was Western Roman Emperor of from 383 to 388.

Magnus Maximus in Roman Biography Maxi-mus, [Fr. Maxime, mik'sem'; It. Massimo, mas'se-mo, ] (Magnus Clemens,) a usurper of the Roman empire, was a native of Spaiti. Having for several years commanded the Roman army in Britain with success, he revolted against Gratian about 381 A.D., and was proclaimed emperor by his soldiers. He then invaded Gaul to offer battle to Gratian, who was defeated, or fled without fighting, and was killed in 383. Theodosius and Valentinian recognized him as Emperor of Gaul, Spain, and Britain. Attempting to obtain Italy also by conquest, he was defeated by Theodosius, taken prisoner, and executed in 388 A.D. See Le Beau, " Histoire du Bas-Empire ;" Tillemont, " Histoire des Empereurs."

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Magnus Maximus in Wikipedia Magnus Maximus (ca. 335–August 28, 388), also known as Maximianus and Macsen Wledig in Welsh, was Western Roman Emperor of from 383 to 388. As commander of Britain, he usurped the throne from emperor Gratian in 383. However, through negotiation with Theodosius I the following year he was made emperor in Britannia and Gaul - while Gratian's brother Valentinian II retained Italy, Pannonia, Hispania, and Africa. Nevertheless Maximus' ambitions led him to invade Italy in 387, leading to his defeat by Theodosius at the Battle of the Save in 388. His defeat marked the end of real imperial activity in northern Gaul and Britain...

https://en.wikipedia.org/wiki/Magnus_Maximus

Maxĭmus, Clemens in Harpers Dictionary A Roman emperor, A.D. 383-388, in Gaul, Britain, and Spain, was a native of Spain. He was proclaimed emperor by the legions in Britain in 383, and forthwith crossed over to Gaul to oppose Gratian, who was defeated by Maximus, and was shortly afterwards put to death. Theodosius found it expedient to recognize Maximus as emperor of Gaul, Britain, and Spain, in order to secure Valentinian in the possession of Italy. Maximus, however, aspired to the undivided empire of the West, and accordingly, in 387, he invaded Italy at the head of a formidable army. Valentinian was unable to resist him, and fled to Theodosius in the East. Theodosius forthwith prepared to avenge his colleague. In 388 he forced his way through the Noric Alps, which had been guarded by the troops of Maximus, and shortly afterwards took the city of Aquileia by storm and there put Maximus to death. Victor, the son of Maximus, was defeated and slain in Gaul by Arbogastes, the general of Theodosius.

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