Rhea, in Greek religion, ancient goddess, probably pre-Hellenic in origin, who was worshipped sporadically throughout the Greek world. She was associated with fruitfulness and had affinities with Gaea (Earth) and the Great Mother of the Gods (also called Cybele). A daughter of Uranus (Heaven) and Gaea, Rhea was a Titan. She married her brother Cronus, who, warned that one of his children was fated to overthrow him, swallowed his children Hestia, Demeter, Hera, Hades, and Poseidon soon after they were born. Rhea concealed the birth of Zeus in a cave on Mount Dicte in Crete and gave Cronus a stone wrapped in swaddling clothes. This he swallowed in the belief that it was Zeus. Subsequently Cronus was vanquished by Zeus and was forced to disgorge the swallowed children.