The gens Fabia was one of the most ancient patrician families at Rome. The gens played a prominent part in history soon after the establishment of the Republic, and three brothers were invested with seven successive consulships, from 485 to 479 BC, thereby cementing the high repute of the family. The house derived its greatest lustre from the patriotic courage and tragic fate of the 306 Fabii in the Battle of the Cremera, 477 BC. But the Fabii were not distinguished as warriors alone; several members of the gens were also important in the history of Roman literature and the arts.
The family is generally thought to have been counted amongst the gentes maiores, the most prominent of the patrician houses at Rome, together with the Aemilii, Claudii, Cornelii, Manlii, and Valerii; but no list of the gentes maiores has survived, and even the number of families so designated is a complete mystery. Until 480 BC, the Fabii were staunch supporters of the aristocratic policies favoring the patricians and the senate against the plebs. However, following a great battle that year against the Veientes, in which victory was achieved only by cooperation between the generals and their soldiers, the Fabii aligned themselves with the people. Throughout the history of the Republic, they were frequently allied with other prominent families against the Claudii, the proudest and most aristocratic of all Roman gentes, and the champions of the established order.
The most famous legend of the Fabii asserts that, following the last of the seven consecutive consulships in 479 BC, the gens undertook the war with Veii as a private obligation. A militia consisting of over three hundred men of the gens, together with their friends and clients, amounting to a total of some four thousand men, took up arms and stationed itself on a hill overlooking the Cremera, a little river between Rome and Veii. The cause of this secession is said to have been the enmity between the Fabii and the patricians, who regarded them as traitors for advocating the causes of the plebeians. The Fabian militia remained in their camp on the Cremera for two years, successfully opposing the Veientes, until at last they were lured into an ambush, and destroyed.