Lewis & Short

2. Tŭbŭlus, i, m., a Roman cognomen in the gens Hostilia: L. Hostilius Tubulus, a prœtor A. U. C. 611, Lucil. ap. Cic. N. D. 1, 23, 63; Cic. Att. 12, 5, 3; id. Fin. 4, 28, 77; 5, 22, 62.