Battle of Mons Seleucus

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Battle of Mons Seleucus
Part of: Usurpation of Magnentius
date July 3, 353
place at Mons Seleucus in Gaul (today La Bâtie-Montsaléon , France )
output decisive victory of Constantius II.
Parties to the conflict

Roman Empire / West

Roman Empire / East

Commander

Magnus Magnentius

Constantius II


The battle of Mons Seleucus was fought on July 3, 353 between a Roman army under the emperor Constantius II and a Roman army of the usurper Magnus Magnentius .

Magnentius, a Roman general presumably of Frankish origin, had risen in 350 in Gaul against Emperor Constans , whom he had immediately killed. Proclaimed emperor by his troops, he quickly controlled much of the western half of the Roman Empire, while the eastern half remained under Emperor Constantius II, a brother of the overthrown Constans.

In view of the events in the west, Constantius II broke off a campaign he was leading at that time against the Persian Sassanids and led his army to the west. Magnentius went to meet him with his troops. In the battle of Mursa (today Osijek) in the year 351 the usurper was defeated and was forced to withdraw to Gaul with heavy losses, where he was able to stay for two years.

On July 3, 353, Magnentius was finally defeated by the troops of Constantius in the battle of Mons Seleucus (today La Bâtie-Montsaléon in the French department of Hautes-Alpes ). He fled to Lyon , where he committed suicide on August 10 or 11 when his remaining soldiers tried to hand him over to Constantius. The Caesar Decentius , who with his troops to the aid had wanted to come for a week hanged later in Senonae when he received news of the death of his brother.

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