Gaius Flavius Fimbria, according to Cicero, rose to the highest honours in the republic through his own merit and talent.
Fimbria must have acquired his popularity about that time, for previously he had been an unsuccessful candidate for the tribuneship.
What province he obtained after his consulship is unknown, but he seems to have been guilty of extortion during his administration, for M. Gratidius brought an accusation of embezzlement against him, and was supported by the evidence of Marcus Aemilius Scaurus; but Fimbria was nevertheless acquitted.
During the revolt of Saturninus in 100 BC, Fimbria, with other consulars, took up arms to defend the public good.
Cicero describes him as a clever jurist; as an orator he had considerable power, but was bitter and vehement in speaking.