Greek form of Egyptian Ist (reconstructed as Iset or Ueset), which possibly meant "the throne". In Egyptian mythology Isis was the goddess of the sky and nature, the wife of Osiris and the mother of Horus. She was originally depicted wearing a throne-shaped headdress, but in later times she was conflated with the goddess Hathor and depicted having the horns of a cow on her head. She was also worshipped by people outside of Egypt, such as the Greeks and Romans.