Plato, in his "Timaeus", provides a genealogy (probably Orphic) which perhaps reflected an attempt to reconcile this apparent divergence between Homer and Hesiod, in which Uranus and Gaia are the parents of Oceanus and Tethys, and Oceanus and Tethys are the parents of Cronus and Rhea and the other Titans, as well as Phorcys. In his "Cratylus", Plato quotes Orpheus as saying that Oceanus and Tethys were "the first to marry", possibly also reflecting an Orphic theogony in which Oceanus and Tethys, rather than Uranus and Gaia, were the primeval parents. Plato's apparent inclusion of Phorcys as a Titan (being the brother of Cronus and Rhea), and the mythographer Apollodorus's inclusion of Dione, the mother of Aphrodite by Zeus, as a thirteenth Titan, suggests an Orphic tradition in which the Titan offspring of Oceanus and Tethys consisted of Hesiod's twelve Titans, with Phorcys and Dione taking the place of Oceanus and Tethys.