The Twelve Olympian gods are the principal deities in ancient Greek mythology, residing on Mount Olympus. They include Zeus, the king of the gods; Hera, his wife and goddess of marriage; Poseidon, the god of the sea; and Athena, the goddess of wisdom. Other notable gods are Apollo, the god of the sun and arts; Artemis, the goddess of the hunt; and Aphrodite, the goddess of love. These gods each have distinct personalities and domains. Ares represents war, while Demeter is the goddess of agriculture. Hephaestus is the god of fire and craftsmanship, and Hermes serves as the messenger of the gods. Lastly, Dionysus is the god of wine and festivity, completing the pantheon of the Olympians.