Octavius Mamilius, the prince of Tusculum, and son-in-law of Lucius Tarquinius Superbus, the seventh and last King of Rome, was forming an alliance amongst the thirty towns of Latium, with the aim of restoring Tarquin to the throne.
[9][10] In these circumstances it was decided to appoint a single magistrate, originally called the praetor maximus or magister populi, "master of the infantry", but afterwards known simply as the dictator, to oversee the defence of the city.
The dictator then proceeded to nominate Spurius Cassius, who had triumphed over the Sabines the previous year, as his magister equitum, or "master of the horse".
During the remainder of his office, Larcius held the census, negotiated with the various Latin towns in hopes of retaining some old allies and gaining new ones, and presided over the consular elections for the following year.
The dictator Aulus Postumius Albus led the Roman forces to victory at the Battle of Lake Regillus, while the consul Larcius captured the town of Fidenae.
Also in 493, Larcius served as legate to the consul Cominius, his colleague in 501, at the siege of Corioli, where Gaius Marcius Coriolanus gained fame through his valour.
In that year, Livy states that Aulus Postumius Albus was appointed dictator, and led the Roman army to victory over the Latins at the Battle of Lake Regillus.