The gens Flavia was a plebeian family at ancient Rome. Its members are first mentioned during the last three centuries of the Republic. The first of the Flavii to achieve prominence was Marcus Flavius, tribune of the plebs in 327 and 323 BC; however, no Flavius attained the consulship until Gaius Flavius Fimbria in 104 BC. The gens became illustrious during the first century AD, when the family of the Flavii Sabini claimed the imperial dignity. Under the Empire, the number of persons bearing this nomen becomes very large, perhaps due to the great number of freedmen under the Flavian dynasty of emperors. It was a common practice for freedmen to assume the nomina of their patrons, and so countless persons who obtained the Roman franchise under the Flavian emperors adopted the name Flavius, which was then handed down to their descendants. The vast majority of persons named Flavius during the later Empire could not have been descended from the Flavia gens; and indeed, the distinction between nomina and cognomina was all but lost, so that in many cases one cannot even determine with certainty whether it is a nomen or a cognomen. However, because it is impossible to determine which of these persons used Flavius as a gentile name, they have been listed below. Origin The Flavii of the Republic claimed Sabine ancestry, and may have been related to the Flavii who lived at Reate during the first century AD, from whom the emperor Vespasian descended; but the gentilicium is also found in other parts of Italy, such as Etruria and Lucania. The nomen Flavius is of Latin origin, and is derived from the surname Flavus, used by a number of gentes, and meaning "golden" or "golden-brown". It probably referred to the blond hair possessed by an early member of the family. Later use During the later period of the Empire, the name Flavius frequently descended from one emperor to another, beginning with Constantius Chlorus, the father of Constantine the Great. The name became so ubiquitous that it was sometimes treated as a praenomen, to the extent of being regularly abbreviated Fl., and it is even described as a praenomen in some sources, although it was never truly used as a personal name, and from the time of Honorius it appears chiefly in letters. It once again became a regular part of the nomenclature of the eastern emperors from