Maia is the Oscan Earth-Goddess, and an ancient Roman Goddess of springtime, warmth, and increase. She causes the plants to grow through Her gentle heat, and the month of May is probably named for Her. Her name means "She Who is Great", and is related to Oscan mais and Latin majus, both of which mean "more". She is also called Maia Maiestas, "Maia the Majestic", which is essentially a doubling of Her name to indicate Her power, as both "Maia" and "Maiestas" have their roots in latin magnus, "great or powerful". She was honored by the Romans on the 1st and 15th of May, and at the Volcanalia of August 23rd, the holiday of Her sometimes husband, the Fire-God Vulcan.

She seems to have been paired with Vulcan because they were both considered Deities of heat: through the increasing warmth of Maia's spring season flowers and plants sprouted and grew; while Vulcan's stronger summer heat brought the fruits to ripeness. The flamen Volcanalis, the priest who officially oversaw the rites of Vulcan, sacrificed a pregnant sow to Maia on the first day of May. The offering of a pregnant sow was traditionally given to Earth-goddesses such as Tellus or Ceres and signified both the remarkable fecundity of the Earth (as there are usually between six and twelve in a litter) as well as the darker side of the Earth Mother, as sows have been known to eat their young. Rites to Maia were also performed at the August Volcanalia, a festival to ward off the destructive fires that could be caused by the dry weather and burning sun of summertime.

In a later period, Maia was confused with a Greek Goddess of the same name. This Maia (whose name in Greek can take such various meanings as "midwife", "female doctor", "good mother", "foster mother", or "aunty") was a nymph and the mother of Hermes, the trickster God of merchants, travellers, and liars; She was also said to have been the eldest and most beautiful of the seven sisters who formed the constellation of the Pleiades, whose heliacal rising (meaning when the constellation is just visible in the east before the sun rises) signalled the beginning of summer. Through this association the Roman Maia became the mother of Mercury, and Her festival on the Ides of May (the 15th) coincided with the festival commemorating the date of the dedication of His temple on the Aventine.

Ovid gives several possibilities as to how the month May got its name, and though he admits confusion, one of the possibilities he gives is that it is named after the personification of Majesty, whom he describes as seated in a place of high honor on Mt. Olympos, clothed in gold and purple. At face value it would seem he simply made this up; but as an alternate name (not just an epithet) of Maia is Maiesta, "Majesty", he may have been closer than he thought. Though a Goddess of the merry flowering springtime may seem kinda fluffy-bunny, the roots of Her name point to a powerful and ancient great Goddess of the Earth, growth, fertility and heat. It is rumoured that Maia was the ancient and original name of the Bona Dea ("the Good Goddess"), Whose name was so sacred it was forbidden to be spoken aloud; and through this connection Maia was associated with the Goddesses Fauna and Fatua. She was also associated with Ops, the Earth-Goddess who symbolizes the wealth of the Earth, and the eastern Great Mother Cybele.

Alternate names: Maiesta, Maja, Majestas, Majesty.