Anna's sister, Dido, killed herself after being rejected by Aeneas. Anna fled to Latium, where Aeneas welcomed her. Dido's ghost then told Anna of Aeneas' wife's (Lavinia) jealousy. Anna drowned herself in the river Numicius.
In some sources, Anna and Dido were not related.
After her death, Anna Perenna became the goddess of the new year, which was celebrated on March 15. She was populist and always sided with the poor and unlucky. She was a moon-goddess as well.