In Puranas, which are part of the Hindu texts, the earth-goddess Prithvi was in the form of a cow, successively milked of beneficent substances for the benefit of humans, by deities starting with the first sovereign: Prithu milked the cow to generate crops for humans to end a famine. Kamadhenu, the miraculous "cow of plenty" and the "mother of cows" in certain versions of the Hindu mythology, is believed to represent the generic sacred cow, regarded as the source of all prosperity. In the 19th century, a form of Kamadhenu was depicted in poster-art that depicted all major gods and goddesses in it. Govatsa Dwadashi which marks the first day of Diwali celebrations, is the main festival connected to the veneration and worship of cows as chief source of livelihood and religious sanctity in India, wherein the symbolism of motherhood is most apparent with the sacred cows Kamadhenu and her daughter Nandini.