Yastasif (Gushtasp)

Yastasif, a king of the Persians, who became a Magian in his time ¹.

al-Mas'udi reports that he removed the idols from the great house on a mountain-top at Isfahan called Mars, and made it his house of fire. al-Mas'udi says that this house is three farsakhs from Isfahan, and was revered by the Magians until his own time ¹.