Lewis & Short

2. Astur, ŭris, adj. m., of or belonging to the province of Asturia, in Hispania Tarraconensis, Asturian: equus, Mart. 14, 199; v. Asturco: exercitus, Sil. 1, 252.
Subst., m., an Asturian: belliger Astur, Sil. 12, 748: regio Asturum, Plin. 4, 20, 34, § 111: conventus Asturum, id. 3, 3, 4, § 18: Cantabri et Astures validissimae gentes, Flor. 4, 12, 46 and 54.