Lewis & Short

Grātĭus, a,

  1. I. name of a Roman gens.
      1. 1. Gratius, ii, m., the opponent of the poet Archias, Cic. Arch. 4, 8; 6, 12.
      2. 2. Gratius Faliscus, a contemporary of Ovid, author of a poem on hunting, Cynegeticon, Ov. P. 4, 16, 34.
  2. II. Deriv.: Grātĭānus, a, um, adj., of or belonging to a Gratius, Gratian: vasa ex argento, Plin. 33, 11, 49, § 139.
    Subst.: Grātiānus, i, m., son and co-regent of the emperor Valentinian I., from 367 to 383 A. D.