In Latin, Patres Conscripti. The Roman senate. Romulus instituted a senate consisting of a hundred elders, called Patres (Fathers). After the Sabines joined the State, another hundred were added. Tarquinius Priscus, the fifth king, added a third hundred, called Patres Minorum Gentium. When Tarquinius Superbus, the seventh and last king of Rome, was banished, several of the senate followed him, and the vacancies were filled up by Junius Brutus, the first consul. The new members were enrolled in the senatorial register, and called Conscripti; the entire body was then addressed as Patres [et] Conscripti or Patres, Conscripti.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894