[2] He had one known son, Marcus Valerius Lactuca Maximus, the consul suffect in 437 BC.
In 458 BC, Marcus Valerius was elected quaestor, with Titus Quinctius Capitolinus Barbatus as his colleague.
They continued the prosecution against the tribune of the plebs, Marcus Volscius Fictor started by the previous year's quaestors.
[3][4][5] In 456 BC, he was elected consul together with Spurius Verginius Tricostus Caeliomontanus.
Valerius and his colleague eventually came to a compromise with the tribunes, which resulted into a new law, known as the Lex Icilia de Aventino publicando, which allocated the Aventine Hill for the benefit of the commons.