...hters, Procne and Philomela, and twin sons, Erechtheus and Butes. But war having broken out with Labdacus on a question of boundaries, he called in the help of Tereus, son of Ares, from Thrace , and having with his help brought the war to a successful close, he gave Tereus his own daughter Procne in marriage. Tereus had by her a son Itys, and having fallen in love with Philom...