Liber in the context of Viticulture

Proserpina (/proʊˈsɜːrpɪnə/ proh-SUR-pih-nə; Latin: [proːˈsɛrpɪna]) or Proserpine (/ˈprɒsərpaɪn/ PROSS-ər-pyne) is an ancient Roman goddess whose iconography, functions and myths are virtually identical to those of the Greek Persephone. Proserpina replaced or was combined with the ancient Roman fertility goddess Libera, whose principal cult was housed in a temple atop Rome's Aventine Hill, which she shared with the grain-goddess Ceres and the wine god Liber (Liber Pater).

Each of these three deities occupied their own cella at the temple, their cults served or supervised by a male public priesthood. Ceres was by far the senior of the three, one of the Dii Consentes, Rome's approximate equivalent to the Greek Twelve Olympians, Ceres being identified with the Greek Demeter and Liber with Dionysus. Libera is sometimes described as a female version of Liber Pater, concerned with female fertility. Otherwise she is given no clear identity or mythology by Roman sources, and no Greek equivalent. Nothing is known of her native iconography: her name translates as a feminine form of Liber, "the free one". Proserpina's name is a Latinization of "Persephone", perhaps influenced by the Latin proserpere ("to emerge, to creep forth"), with reference to the growing of grain.

Fontus or Fons (pl.: Fontes, "Font" or "Source") was a god of wells and springs in ancient Roman religion. A religious festival called the Fontinalia was held on October 13 in his honor. Throughout the city, fountains and wellheads were adorned with garlands.

Fontus was the son of Juturna and Janus. Numa Pompilius, second king of Rome, was supposed to have been buried near the altar of Fontus (ara Fontis) on the Janiculum. William Warde Fowler observed that between 259 and 241 BC, cults were founded for Juturna, Fons, and the Tempestates, all having to do with sources of water. As a god of pure water, Fons can be placed in opposition to Liber as a god of wine identified with Bacchus.

The Aventine Triad (also referred to as the plebeian Triad or the agricultural Triad) is a modern term for the joint cult of the Roman deities Ceres, Liber and Libera. The cult was established c. 493 BC within a sacred district (templum) on or near the Aventine Hill, traditionally associated with the Roman plebs. Later accounts describe the temple building and rites as "Greek" in style. Some modern historians describe the Aventine Triad as a plebeian parallel and self-conscious antithesis to the Archaic Triad of Jupiter, Mars and Quirinus and the later Capitoline Triad of Jupiter, Minerva and Juno. The Aventine Triad, temple and associated ludi (games and theatrical performances) served as a focus of plebeian identity, sometimes in opposition to Rome's original ruling elite, the patricians.