Rhea

Rhea was the Titaness daughter of Uranus and Gaia and wife and sister to Cronus. 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, but not as an Olympian goddess in her own right. The Romans identified her with Magna Mater and Ops.

Myths and Genealogy
Cronus and Rhea had six children: Hestia, Hades, Demeter, Poseidon, Hera, and Zeus in that order, but Cronus swallowed them all as soon as they were born, except Zeus, since Cronus had learned from Gaia that he was destined to be overcome by his own child as he had overthrown his own father. When Zeus was about to be born, however, Rhea sought Gaia to devise a plan to save him, so that Cronus would get his retribution for his acts against Uranus and his own children. Rhea gave birth to Zeus in Crete, handing Cronus a stone wrapped in swaddling clothes, which he promptly swallowed.

Rhea hid Zeus in a cave on Mount Ida and he was either raised by Adamanthea, Gaia, or the Kuretes.