[1] His filiation as reported in the Fasti Capitolini suggests he was the son of Aulus Postumius Albus Regillensis, consul 496 BC, and brother of Aulus Postumius Albus Regillensis, consul 464 BC, although it must be observed that no great dependence can be placed upon genealogies from such early times.
He, or possibly his brother Aulus, was appointed to dedicate the Temple of Castor in 484 BC as duumviri aedi dedicandae.
[2][3] He was consul in 466 BC and is credited with the dedication of the temple of Dius Fidius while his consular colleague Quintus Servilius Priscus fought the Aequi.
[4][5] He was either a augur or pontifex as gathered from an inscription saying that he co-opted the year in 462 BC, a role traditionally ascribed to one of these posts.
[8][9][10] He commanded, as legatus, the center of the Roman army in the Battle of Corbio, in which the Aequians and Volscians were defeated in 446 BC.