Nepotianus in Wikipedia

Iulius Nepotianus (died June 30, 350)[1], commonly known in English as Nepotian, was a member of the Constantinian dynasty who reigned as a short-lived usurper of the Roman Empire. He ruled the city of Rome for twenty-eight days, before being killed by his rival usurper Magnentius' general Marcellinus.[1] Background - Nepotianus was the son of Eutropia, half-sister of Emperor Constantine I,[2] and of Virius Nepotianus. On his mother's side, he was the grandson of Emperor Constantius Chlorus and Flavia Maximiana Theodora. Events - After the revolt of Magnentius, Nepotianus proclaimed himself "emperor" and entered Rome with a band of gladiators[2] on 3 June 350.[1] After attempting to resist Nepotianus with an undisciplined force of Roman citizens, the defeated Praefectus urbi Titianus (or Anicius, or Anicetus), a supporter of Magnentius, fled the city. Magnentius quickly dealt with this revolt[2] by sending his trusted magister officiorum Marcellinus to Rome. According to Eutropius, Nepotianus was killed in the resulting struggle (on 30 June), his head put on a lance and borne around the city.[2] In the following days, his mother Eutropia was also killed, during the persecution of the supporters of Nepotianus, most of whom were senators.