Marsyas served as a minister for Dionysus or Bacchus, who was identified by the Romans with their Father Liber, one of three deities in the Aventine Triad, along with Ceres and Libera (identified with Persephone). These gods were regarded as concerning themselves specially with the welfare of the "plebs". The freedom that the ecstasies of Dionysian worship represented took on a political meaning in Rome as the "libertas" that distinguished the free from the enslaved. The Liberalia, celebrated March 17 in honor of Liber, was a time of speaking freely, as the poet and playwright Gnaeus Naevius declared: "At the Liberalia games we enjoy free speech." Naevius, however, was arrested for his invectives against the powerful.