The Julii Iuli were the oldest branch of the ancient patrician Julia gens, and their magistracies span nearly a century and a half leading to Gaius' dictatorship. However, only one other member of the family is recorded following the sack of Rome by the Gauls in 390 BC: Lucius Julius Iulus, who was consular tribune in 388, and again in 379. As Gaius' filiation has not been preserved, it is uncertain whether he was the son of this Lucius, or perhaps one of his predecessors, such as the Lucius who was consular tribune in 401 and 397, or the Lucius who was consular tribune in 403, or the Gaius Julius Iulus who was consular tribune in 408 and 405, and censor in BC 393. In any case, he is the last of the Julii Iuli known to have held any magistracy. Whether the family ended with him, or continued on in obscurity, or perhaps under a different cognomen, is similarly unknown.