Herodotus (1.7) refers to a Heraclid dynasty of kings who ruled Lydia, yet were perhaps not descended from Omphale, writing, "The Heraclides, descended from Heracles and the slave-girl of Iardanus..." Omphale as slave-girl seems odd.
An earlier genealogy may have made Agron, as a legendary first king of an ancient dynasty, to be a son of the mythical Ninus, son of Belus, and stopped at that point.