Gaius Julius Iulus
|Consul of the Roman Republic|
13 December 447 BC - 13 December 446 BC 
Serving with Marcus Geganius Macerinus
|Lars Herminius Aquilinus, Titus Virginius Tricostus Caeliomontanus|
|Titus Quinctius Capitolinus Barbatus, Agrippa Furius Fusus|
13 December 435 BC - 12 December 433 BC
Serving with Proculus Verginius Tricostus
|Lucius Papirius Crassus, Marcus Cornelius Maluginensis|
Julius was the son of the Gaius Julius Iulus who had been consul in 482 BC, and a member of the first decemvirate in 451. He was probably the grandson of the Gaius Julius Iulus who held the consulship in 489. Julius' uncle, Vopiscus Julius Iulus, was consul in 473. Some of the Julii Iuli who followed Gaius in the chief magistracies over the next several decades may have been his descendants, but the only ones who attained the consulship and whose filiations are known were his uncle's son and grandson.
Consul for the first time in BC 447, Julius and his colleague, Marcus Geganius Macerinus, inherited a state still rife with tension between the aristocratic party in the senate, and the people, whose chief defenders were the tribunes of the plebs. The consuls were directed to recruit soldiers to fight the Aequi and the Volsci, an action that was certain to inflame the populace; but as no threat appeared imminent, they suspended the order, reasoning that unrest in the city would only encourage Rome's enemies. Despite their measures to keep the peace, the consuls were unable to prevent the more extreme elements of the aristocratic faction from banding together to harass and intimidate the tribunes, until in fear of their very lives they became utterly ineffectual.
In Julius' second consulship, BC 435, Rome was in the midst of an epidemic that had started the previous year. Ordinary plans to raise an army against rival cities had to be abandoned, giving an opening to the men of Fidenae. Aided by the Veientes, the Fidenates took the field and advanced deep into Roman territory, according to Livy advancing almost within sight of the Colline Gate. Julius took what soldiers he could and manned the city walls, while his colleague, Proculus Verginius Tricostus, convened the senate in the temple of Quirinus, and then nominated Quintus Servilius Priscus Structus as dictator.
Servilius and his magister equitum, Postumus Aebutius Elva, called a muster of all able-bodied men outside the Colline Gate, and immediately took the field. Alarmed by the Roman activity, the Fidenates and their allies retreated, and were harried by the dictator's army until they took refuge within the walls of Fidenae. Lacking the resources to maintain a long siege, Servilius entrenched his men and gave the impression of a siege, while sappers dug a passage under the city wall and into the citadel, which Servilius then captured, earning for himself the surname Fidenas.
Julius and Verginius served out the remainder of their term uneventfully. The only other event of note was the holding of a census in the Campus Martius for the first time; one of the censors was Marcus Geganius Macerinus, who had been consul with Julius twelve years earlier.
The historian Gaius Licinius Macer reported that Julius and Verginius were elected consuls again for the following year; but Valerius Antias and Aelius Tubero gave the consuls as Marcus Manlius Capitolinus and Quintus Sulpicius Camerinus Praetextatus, while Macer and Tubero each mentioned alternative traditions by which Manlius and Sulpicius were consular tribunes, together with Servius Cornelius Cossus. Diodorus agrees with the latter account.