A copy of the altar dedicated to Liber and Libera is a Roman monument that was found on the site of the modern town market. The deities on the altar are associated with fertility, wine and viticulture. Liber, the Roman name for Dionysus, and Libera were also associated with the festival of Liberalia, which took place every year on 17 March to celebrate the maturation of young boys to manhood. The full inscription reads:
Dedicated to Liber and Libera, Lucius Valerius Verus, member of the Poetovion Council, master craftsman, manager of the town treasury, town architect, town priest and town judge.
The patron of the inscription, Lucius Valerius Verus, was, based on his clerical career, a successful and wealthy individual. He probably belonged to the influential and wealthy Valerius family, which left a great mark on the history of Poetovio. The altar probably contained a statue of Liber and Libera, which has not been preserved.