Anna Perenna
A Roman goddess of the year, to whom Romans sacrificed in March so that the year would go round well.
Where the months got their names
Macrobius, Saturnalia 1.12–14 (early fifth century CE), in the edition of Franz Eyssenhardt (Leipzig, 1893) · early fifth century CE; the dialogue is set in the 380s
huius etiam prima die ignem nouum Vestae aris accendebant, ut incipiente anno cura denuo seruandi nouati ignis inciperet. eodem quoque ingrediente mense tam in regia curiisque atque flaminum domibus laureae ueteres nouis laureis mutabantur. eodem quoque mense et publice et priuatim ad Annam Perennam sacrificatum itur, ut annare perennareque commode liceat.
On the first day of this month they also lit a new fire on the altars of Vesta, so that the duty of guarding the renewed fire would start again with the new year. As the month began, the old laurel branches in the Regia, the halls of the curiae and the houses of the flamens were also replaced with fresh ones. In this month, too, people sacrifice to Anna Perenna, both for the city and at home, so that they may get safely through the year and on through many years.