She was the personification of the sky. Often depicted as a woman arched over the earth god Geb
She was believed to be the daughter of the gods Shu and Tefnut, the granddaughter of the sun god Ra. Her husband was also her brother, Geb. She was thought to be the mother of four gods; Osiris, Isis, and Nephthys the last born on the fifth day. The days on which these deities were born were known as the "five epagomenal days of the year", and they were celebrated all over Egypt.