Lewis & Short

2. Rēgŭlus, i, m., a Roman surname.

  1. I. Of the Atilii, among whom was the celebrated consul M. Atilius Regulus, who was taken prisoner by the Carthaginians in the first Punic war, Cic. Off. 3, 26, 99; id. Fin. 2, 20, 65; Sen. Prov. 4, 5; cf. Gell. 6, 4, 1 sqq.; Sen. Prov. 3, 4 and 9 sqq.
  2. II. Of the Livineii, Auct. B. Afr. 89, 3; Cic. Fam. 13, 60, 1; id. Att. 3, 17, 1.
  3. III. Another, called by Modestus omnium bipedum nequissimus, Plin. Ep. 1, 5, 14.
  4. IV. Aquilius Regulus, Tac. A. 3, 42.