It is only possible to speculate about the identity of Sīyāvoš's mother since, in the Shahnameh and other important epic sources, her identity is shrouded in mystery. One scholar claims that Sīyāvoš'smother was in fact Sūdābe and that, for moral considerations, they have invented another mother for her. Another scholar holds that she was the archetype of the girls creating Zoroastrians' saviors (sošīyānts).The theory that the writer of the present paper puts forward is that she was originally a parī in its ancient sense of this mythical being, later changed into a beautiful girl as the myths changed and epics developed. In the ancient ideas before Zoroaster, parīs were the goddesses of fertility who ravished the hearts of princes and heroes and married them and raised their children. The writer presents several pieces of evidence to prove his theory; These include: dazzling beauty of Sīyāvoš's mother, her staying in the woods, inconsistency in and the ambiguity concerning her identity, her having no name, her sudden disappearance, the sad ending of her son's life, similarities and dissimilarities with Tahmīne.