The Dodekatheon, more commonly known as the Twelve Olympians, are the major deities of the Greek pantheon, and as such were the principal deities of the Greek pantheon, said to reside atop Mount Olympus. The Olympians gained their supremacy in a war of gods in which Zeus led his siblings to victory over the Titans.
While the number was fixed at twelve, there was considerable variation as to which deities were included. However, the twelve as most commonly portrayed in art and poetry were Zeus, Hera, Poseidon, Demeter, Athena, Apollo, Artemis, Ares, Aphrodite, Hephaestus, Hermes and either Hestia, or Dionysus. Hades, however was not usually included among the Olympians because his realm was the underworld.
There are numerous other minor gods and goddesses that had close ties with the Dodekatheon, but are regardless not counted among their ranks. The Dodekatheon were also said to have ties with other groups of deities both across the West, the North, and the East. And, as with most of the gods, because of their arrogance they do not bother to form companionship or allegiance with lesser known pantheons. They have the closest allegiance to the Norse gods, known as the Aesir, often on rare occasions address one another in order to discuss important or critical matters.