I. A town of the Sabines, whence Appius Claudius emigrated to Rome, Liv. 2, 16 Drak.; also called Rēgilli , ōrum, m., Suet. Tib. 1.— Hence, Rēgillānus , a, um, and Rēgillensis , e, adj., of or belonging to Regillus: “Claudius Appius Regillanus,” Suet. Tib. 2: “Claudius Regillensis,” Liv. 8, 15.—
II. A small lake in Latium (the mod. Cornufelle), celebrated for the victory over the Latins gained there by the Romans under the dictator Postumius, Cic. N. D. 3, 5, 11; “called also lacus Regillus,” Liv. 2, 19; Plin. 33, 2, 11, § 38; “and Regilli lacus,” Flor. 1, 11, 2; Aur. Vict. Vir. Ill. 16.— Hence, Rēgillensis , surname of the Postumii: “M. Postumio Regillensi,” Liv. 4, 49, 7: “A. et L. Postumii Regillenses,” id. 6, 22, 5.—
III. A Roman surname in the Æmilian gens, Cic. Att. 12, 24, 2: “M. Aemilius Regillus,” Liv. 24, 7 fin.; 8; 29, 11 fin.; 38.

