March 31st | Fastorum Liber Tertius: Martius
B C | Pr. Kal. | III.883-884, Ovid notes that the last deity to be honored in March is the Moon.
Luna regit menses: huius quoque tempora mensis
finit Aventino Luna colenda iugo.
883 The moon rules the months: the period of this month also ends with the worship of the Moon on the Aventine Hill.