His first wife was Metis. His second, who was known as his wife on Olympus, was the jealous Hera. But there was also Themis, the goddess of Justice, with whom he produced the Hours, the Fates and the Mnemosyne - meaning "memory " - who gave birth to nine Muses. In order to achieve his aims, Zeus metamorphosed. He was an expert at changing shape and form. He turned into a charming prince in order to seduce Semele, the king of Thebes' daughter, who gave birth to the god Dionysos. He also turned into a golden shower, a bull and even into another God. In order seduce the nymph Callisto, who was a follower of Artemis, the Goddess of Hunting, Zeus turned into Artemis herself.