Titus Herminius, surnamed Aquilinus (died 498 BC), was one of the heroes of the Roman Republic. He participated in two of the most famous conflicts that attended the birth of the Republic, and was elected consul in 506 BC. However, his greatest fame was won as one of the defenders of the Sublician bridge against the army of Lars Porsena, the King of Clusium.
The Herminii were a patrician family at Rome during the early years of the Republic. The Romans themselves regarded the family as Etruscan, and they were one of the few Roman gentes to use distinctly Etruscan praenomina; Lars Herminius held the consulship in 448 BC. However, in the legend of the Sublician bridge, Titus Herminius may have represented the Sabine element of the Roman people.
Following the expulsion of the king Lucius Tarquinius Superbus from Rome in 509 BC, Lars Porsena, the King of Clusium, resolved to conquer Rome, either to restore the Etruscan monarchy, or possibly for himself. The following year he went to war with Rome, and advanced with his army upon the city. After successfully capturing those parts of the city on the Etruscan side of the Tiber, including the Janiculum, the Clusian army approached the Pons Sublicius, a wooden bridge leading into the city proper. The Roman forces withdrew to the eastern side of the river, as engineers began the work of destroying the bridge's supports. Three Romans remained on the bridge to fend off the Etruscans: Publius Horatius Cocles, Spurius Lartius, and Herminius.