Māra is the most complex of the Latvian goddesses, the great feminine power set over the earthly and bodily half of existence. In Biezais's influential reconstruction the folk-song cosmos is divided between Dievs, who governs the sky and the soul, and Māra, who rules the material world, the flesh, and the fertile earth. She is above all the protectress of cattle and of the milk-giving cow, and she attends women in labour, receiving the newborn into physical life. Her name and much of her cult were overlaid by that of the Virgin Mary after Christianisation, and her chief feast day, Māras diena, coincides with the Assumption; scholars nonetheless recognise beneath the Marian surface an older native mother-deity of soil, herd and human fertility.