I.a leader of the Gauls who defeated the Romans at the river Allia, Liv. 5, 38, 3; Serv. ad Verg. A. 6, 826.—Hence, Brennĭcus , a, um, adj., of Brennus: “signa,” Sid. Carm. 7, 561.—
II. A king of the Gauls who invaded Greece in the second century B.C. and attacked Delphi, Cic. Div. 1, 37, 81; Just. 24, 5 sqq.; Val. Max. 1, 1, 18; Prop. 3, 13 (4, 12), 51.