Lewis Short
(adjective) : Grātĭus, a
* Name of a Roman gens.
* Gratius, ii, m., the opponent of the poet Archias, Cic. Arch. 4, 8; 6, 12.
* Deriv.: Grātĭānus, a, um, , 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.
Charlton T. Lewis, Charles Short, A Latin Dictionary