Arruns Tarquinius was the younger son of Demaratus of Corinth, who migrated to the Etruscan city of Tarquinii in the seventh century BC. He died shortly before his father, leaving his wife pregnant. When Demaratus died, he left no inheritance for his grandson, also named Arruns, who was thus born into poverty, although Demaratus had been wealthy. The child came to be called Egerius, meaning "the needy one."