Lewis & Short

Maxentĭus, i, m.,

  1. I. a Roman emperor, Eutr. 10; Aur. Vict. Epit. 54.
    Hence,
  2. II. Maxentĭānus, a, um, adj., of or belonging to the emperor Maxentius: milites, Lact. Mort. Pers. 44, 3.