In ancient Roman mythology and religion, Liber ("the free one"), also known as Liber Pater ("the free Father") was a god of viniculture and wine, fertility and freedom. He was a patron deity of Rome's plebeians and was part of their Aventine Triad. His festival of Liberalia (March 17) became associated with free speech and the rights attached to coming of age. His cult and functions were increasingly associated with Bacchus and his Greek equivalent Dionysus, whose mythologies he came to share.