ANNA PERENNA  , an old Roman deity of the circle or " ring " of the year, as the name (per annum) clearly indicates . Her festival fell on the full moon of the first month (March 15), and was held at the grove of the goddess at the first milestone on the Via Flaminia . It was much frequented by the city plebs, and Ovid describes vividly the revelry and licentiousness of the occasion (Fasti,iii . 523 foil.) . From Macrobius we learn (Sat. i . 12 . 6) that sacrifice was made to her " ut annare perannareque commodeliccat," i.e. that the circle of the year may be completed happily . This is all we know for certain about the goddess and her cult; but the name naturally suggested myth-making, and Anna became a figure in stories which may be read in Ovid (l.c.) and in Silius Italicus (8.5o foil.) . The coarse myth told by Ovid, in which Anna plays a trick on Mars when in love with Minerva, is probably an old Italian folk-tale, poetically applied to the persons of these deities when they became partially anthropomorphized under Greek influence . (W . W .