 Likewise, it was most likely during this period that legendary and epic texts were collected by the Sasanians, including the legend of the Iranian hero-king Fereydun (Frēdōn in Middle Persian), who split up his kingdom among his three sons; his eldest son Salm receiving the empire of the West, Rome; the second eldest Tur receiving the empire of the East, Turan; and the youngest Iraj receiving the heartland of the empire, Iran.Accordingly, influenced by the texts about the Kayanians, Yazdegerd II may believed to be the heir of the Fereydun and Iraj, thus possibly deeming not only Roman domains in West as belonging to Iran, but also the eastern domains of the Hephthalites.Thus the Sasanians may have sought to symbolically assert their rights over those lands by assuming the Kayanian title of "kay".