In Greek mythology, the Titans (Greek: Τιτᾶνες, Titânes, singular: Τιτάν, -ήν, Titán) were the pre-Olympian gods. According to the Theogony of Hesiod, they were the twelve children of the primordial parents Uranus (Sky) and Gaia (Earth), with six male Titans: Oceanus, Coeus, Crius, Hyperion, Iapetus, and Cronus, and six female Titans, called the Titanides (Greek: Τιτανίδες, Titanídes; also Titanesses): Theia, [[Rhea (mythology)|Rhea], Themis, Mnemosyne, Phoebe, and Tethys. Cronus mated with his older sister Rhea and together they became the parents of the first generation of Olympians – the six siblings Zeus, Hades, Poseidon, Hestia, Demeter, and Hera. Some descendants of the Titans, such as Prometheus, Helios, and Leto, are sometimes also called Titans.
The Titans were the former gods – the generation of gods preceding the Olympians. They were overthrown as part of the Greek succession myth, which told how Cronus seized power from his father Uranus and ruled the cosmos with the Titans as his subordinates, and how Cronus and the Titans were in turn defeated and replaced as the ruling pantheon of gods by Zeus and the Olympians in a ten-year war called the Titanomachy. As a result of this war of the gods, Cronus and the vanquished Titans were banished from the upper world and held imprisoned under guard in [[Tartarus)) although apparently, some of the Titans were allowed to remain free.