in fabulous history, the wife of Cadmus, both of whom were turned into serpents. See Cadmus.

Though many of the ancient authors make Harmonia a princess of divine origin, there is a passage in Athenaeus from Euhemerus, the Vanini of his time, which tells us, that she was by profession a player on the flute, and in the service of the prince of Zidon previous to her departure with Cadmus. This circumstance, however, might encourage the belief, that as Cadmus brought letters into Greece, his wife brought harmony thither; as the word ἀγωνία harmonia, has been said to have no other derivation than from her name: which makes it very difficult to ascertain the sense in which the Greeks made use of it in their music; for it has no roots by which it can be decomposed, in order to deduce from them its etymology. The common account of the word, however, that is given by lexicographers, and generally adopted by the learned, does not confirm this opinion. It is generally derived from ἀγωνία, and this from the old verb ἀγωνία apto, to fit or join.