Lewis & Short

† thrŏnus, i, m., = θρόνος,

  1. I. an elevated seat, a throne (syn. solium): Jovis, Plin. 35, 9, 36, § 63; Poët. ap. Suet. Aug. 70: dei, Prud. Hamart. 10 praef.; Auct. Pervig. Ven. 7: Thronos Caesaris, one of the constellations, Plin. 2, 70, 71, § 178.
  2. II. An angelic order: sive throni, sive dominationes, Vulg. Col. 1, 16.