 His family was evidently part of the Veientine aristocracy, and its nomen is found on a number of inscriptions from votive offerings.Tolumius enters history when the Roman colony of Fidenae revolted against the Republic in 438 BC, and allied itself with Veii, giving Tolumnius control of the Fidenate army.The Romans sent four envoys (Tullus Cloelius, Gaius Fulcinius, Spurius Antius, and Lucius Roscius) to Fidenae to demand an explanation, but they were murdered by the Fidenates, apparently on the king's orders.