[5][6][7][8] The name "Regillensis" is usually supposed to have been derived from this battle; but Niebuhr thinks that it was taken from a place of residence, just as the Claudii bore the same name, and that the later annalists only spoke of Postumius as commander in consequence of the name.

Livy states expressly that Scipio Africanus was the first Roman who obtained a surname from his conquests.

[9][10] In 495 BC, Postumius was chosen at short notice by the Romans to lead the cavalry to victory against a Sabine invading force.

[11] In 493 BC Postumius was one of the ten envoys sent by the senate to treat with the plebeian leaders during the first secessio plebis.

[12] Postumius' career prior to his consulship and dictatorship is not known, but he might have been the military tribune who is mentioned in 504 BC serving under the consul Publius Valerius Poplicola.