The "uniter," Harmonia is the daughter of Aphrodite and Ares. Some stories say the legendary Amazons claimed descent from her. Harmonia also founded the dynasty of Thebes and bore the famous Dionysian women Semele, Agave, Autonoe, and Ino. At Harmonia's wedding, all the Olympians bore magical gifts, including a famous necklace from Aphrodite that gave irresistible sexuality (or undying beauty, depending on the source) to the wearer.
She was known as Concordia in Roman mythology.