Brennus, fl. c.389 BC, legendary Gallic leader. He occupied Rome but failed to take the Capitol from Manlius (Marcus Manlius Capitolinus). According to legend, when the tribute that the Romans had agreed to pay was being weighed, a Roman complained, whereupon Brennus threw his sword on the scale, crying, "Vae victis!" [woe to the vanquished]. His historical existence is dubious.

Brennus, d. 279 BC, Gallic leader. He was in command of the band of Gauls (or Galatians) who invaded Greece in 279 BC At first halted at Thermopylae, he later turned and took the pass into Doris. He was wounded in an unsuccessful attack on Delphi and is supposed to have committed suicide on the northward retreat after the Gauls were attacked by the Thessalians.