Lewis & Short

2. Jŏvĭus, ii, m.,

  1. I. a surname of the emperor Diocletian.
  2. II. Derivv.
    1. A. Jŏ-vĭus, a, um, adj., of or belonging to Diocletian: cohors, a legion of honor instituted by Diocletian, Claud. B. Gild. 418.
    2. B. Jŏ-vĭānus, a, um, adj., the same; hence, subst.: Jŏvĭāni, soldiers of Diocletian’s legion of honor, Amm. 22, 3, 2 al.