Lucius Junius Brutus
Rome's seventh and final king, Lucius Tarquinius Superbus, executed many of the leading men in the senate, and did not replace them, thereby diminishing their number. However, in 509 BC Rome's first and third consuls, Lucius Junius Brutus and Publius Valerius Publicola chose from amongst the leading equites new men for the senate, these being called "conscripti", and thus increased the size of the senate to 300.