Rhea or Rheia (/ˈriːə/; Ancient Greek: Ῥέα [r̥é.aː] or Ῥεία [r̥ěː.aː]) is a goddess in Greek mythology, the Titaness daughter of the earth goddess Gaia and the sky god Uranus, Gaia's son. She is the older sister of Cronus, who was also her consort. In early traditions, she is known as "the mother of gods" and therefore is strongly associated with Gaia and Cybele, who have similar functions. The classical Greeks saw her as the mother of the Olympian gods and goddesses. The Romans identified her with Magna Mater (their form of Cybele), and the Goddess Ops.