Varuna is a sky god of the VEDAS who has many, sometimes contradictory traits. He is the Indian counterpart of the Greek Ouranos. Varuna is paired with several deities in rituals and hymns, most commonly with MITRA. By himself, Varuna is seen as a guardian over the cosmic order. He is called the sovereign ruler of the universe, but this is said of other Vedic gods. Later he becomes the Indian god of the ocean.
Further reading: John Dowson, A Classical Dictionary of Hindu Mythology and Religion, Geography, History, and Literature, 12th ed. (Ludhiana: Lyall Book Depot, 1974); Alfred Hillebrandt, Vedic Mythology, 2 vols. (Delhi: Motilal Banarsidass, 1990); Heinrich Luders, Varuna, 2 vols. (Gottingen: Vanderhoeck & Ruprecht, 1951–59); W. J. Wilkins, Hindu Mythology, Vedic and Puranic, 2d ed. (Calcutta: Rupa, 1973).
Encyclopedia of Hinduism. A. Jones and James D. Ryan. 2007.