Anna Perenna was an old Italic goddess of the year — anna being the same root as annus, with Perenna meaning "continuing through the year" — and her great festival was kept on the Ides of March, which had been the new year's day before the Julian reform. Upon that day all the people of Rome went out to the bank of the Tiber, encamped by the river in temporary shelters of branches, drank wine in great quantity, and prayed to live as many years as they had been able to drink cups of wine. The picnic in the river-meadow was followed by singing, dancing, and a generally bacchanalian conclusion.
Of who Anna Perenna had been before becoming the goddess of the year, the Romans told several stories. Some said she had been Anna, the sister of Dido of Carthage: that after Dido's death she had fled to Italy, where Aeneas had received her with kindness, but where she had aroused the jealousy of Lavinia and so cast herself into the river Numicius and become a nymph. Others said she was an old woman of Bovillae who had brought bread to the plebs during their secession to the Sacred Mount, and had been deified for that service. Still others identified her with Themis, or with Io, or with the moon. Ovid records all these accounts and seems untroubled to choose among them.
What the original cult of Anna Perenna was, beneath the fanciful etiologies, the Romans had largely forgotten. Recent excavations in Rome (uncovered in 1999 in the Piazza Euclide) revealed the cult-site of Anna Perenna, with hundreds of inscribed lead curse-tablets and votive coins thrown into the spring through the imperial period; the goddess was clearly invoked into the fourth century as a power both protective and dangerous, by people who knew her older than the festive picnic Ovid describes.



