Second order of divine beings in Greek mythology

In Greek mythology, the Titans were the pre-Olympian gods. According to the Theogony of Hesiod, they were the twelve children of the primordial parents Uranus (Sky) and his mother, Gaia (Earth), with six male Titans: Oceanus, Coeus, Crius, Hyperion, Iapetus, and Cronus, and six female Titans, called the Titanides : Theia, 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.