I.the name of a Roman gens. So esp.,
1. M. Popillius Laenas, a consul A. U.C. 395, Cic. Brut. 14, 56.—
2. C. Popilius Laenas, the assassin of Cicero, Liv. Epit. 120; Sen. Suas. 7.—
3. In fem.: “Popilia,” the wife of Q. Catulus, Cic. de Or. 2, 11, 44.— Hence,