The six (6) original Olympians were the children of Cronos and Rhea (Zeus, Hera, Poseidon, Demeter, Hestia, and Hades). The twelve (12) mighty Olympians gained their supremacy in the world after Zeus led his siblings to victory in the war with the Titans. Hades was not included because he resided in his home of the Underworld, rarely speaking with any of the other Gods. Later on, there were twelve (12) true Olympians, which included: Zeus, Hera, Poseidon, Demeter, Ares, Hermes, Hephaestus, Aphrodite, Athena, Apollo, Artemis, Dionysus and Hestia, who later gave up her throne for Dionysus. The six (6) original Olympians were Hades, Hestia, Poseidon, Demeter, Hera, and Zeus. In Greek Mythology, the Olympians (Δωδεκάθεον), were the principal Gods of the Greek Pantheon, residing atop Mount Olympus, a place forbidden for any Mortal to travel unless given direct authorization to do so by the Gods themselves.
The Olympians, along with the Titans, and Primordials were supreme mythical Gods that can create and control all kinds of magic and power. 5.2 Pre-Olympian Gods (Titans and Primordials).