Decentius died #onthisday 18th August 353 A.D. He was a usurper of the Western Roman Emperor and rose against the Emperor Constantius II.

According to the Scholar Michael DiMaio, Decentius was perhaps the brother of Magentius who had revolted against Constantius on 18th January 350 A.D.

Then, Magnentius elevated Decentius as Caesar by that winter, Decentius was the overseer of Gaul and Rhine frontier for which he was appointed Consual Ordinarius in 352 A.D. Magentius was defeated by the Constantius, and he had committed suicide. Decentius then charged with the reinforcements had hung himself at Senonae.