Ra (pronounced Rah) and sometimes as, Rê, is an ancient Egyptian sun god. By the fifth dynasty he became a major deity in ancient Egyptian religion, identified primarily with the mid-day sun, with other deities representing other positions of the sun. Ra changed greatly over time and in one form or another, much later he was said to represent the sun at all times of the day. The chief cult centre of Ra first was based in Heliopolis (ancient Inunu) meaning "City of the Sun." In later Egyptian dynastic times, Ra was merged with the god Horus, as Re-Horakhty (and many variant spellings). When his worship reached this position of importance in the Egyptian pantheon, he was believed to command the sky, the earth, and the underworld. He was associated with the falcon, the symbol of other sun deities who protected the pharaohs in later myths. After the deities were paired with pharaohs, the children of Hathor were considered to be fathered by Ra.
Although not the contemporary view, E. A. Wallis Budge (1857–1934) claims that Ra was the one god of Egyptian monotheism, of which all other deities were aspects, manifestations, phases, or forms. He asserted that Hymn to Ra (c. 1370s BC) was written to stress the pantheistic nature of Ra to combat encroaching polytheism. In this homage several deities are described not as beings in their own right, but as certain forms of Ra. For example:
Ra is most commonly pronounced 'rah'. It is more likely, however, that it should be pronounced as 'rei'; hence the alternative spelling Re rather than Ra. The meaning of Ra's name is uncertain, but it is thought if not a word for 'sun' it may be a variant of or linked to 'creative'. As his cult arose in the Egyptian pantheon, Ra often replaced Atum as the father, grandfather, and great-grandfather of the deities of the Ennead, and became a creator of the world.