Dyaus Pitar, heaven father, is the creator god mentioned in the Rg Veda and other Vedic texts. He is associated with the goddess Prthivi, and this primordial couple is normally addressed as Dyavaprthivi. It is believed that between them they created the entire Vedic pantheon, placed heaven and earth in conjunction with one another and generally preserved the cosmic order. Dyaus Pitar is overshadowed and superseded by the rain god Indra, possibly because Aryan settlers brought him into India from the north who had been used to a cold and bleak climate and who needed a supreme deity more relevant to a hot, dry environment. A.G.H.
Jordan, Michael, Encyclopedia of Gods, New York, Facts On File, Inc. 1993, p. 71