Népotien , ( Flavius Popilius Nepotianus ), is the nephew of Constantin {{Ier}} and Consul in 336.

He is made proclaim emperor in 350 and overcomes Anicet, Préfet of the court of Magnence. He itself is beaten under the walls of Rome by Marcellin, general of Magnence, and put at died after 23 days of reign.