The Roman god of wine and fertility paired with the goddess Libera was Liber.
Liber was an ancient Roman god of viticulture, wine, male fertility, and freedom. He was also known as Liber Pater, meaning “Free Father,” and became an important patron of Rome’s plebeians. His pairing with Libera belongs to an old Italian fertility tradition in which the two deities represented complementary male and female powers.
Liber, Libera, and Ceres formed the Aventine Triad, a major cult grouping associated with Rome’s common citizens. Liberalia, Liber’s festival, was celebrated on March 17. The festival included honey cakes and rites connected with young men entering adulthood, including the assumption of the toga virilis by newly eligible male citizens.
Liber became increasingly identified with Bacchus and the Greek Dionysus, especially in later Roman culture. That creates a common quiz trap: Bacchus is a defensible name for the wine god in Romanized Greek tradition, but the question asks for the deity paired with Libera, making Liber the precise canonical answer. Libera herself was associated with female fertility and was later linked with Proserpina in some traditions.