Avesta knows the birthplace of Schooserasht as a place called “Ridge” the river “Derji” also Lake Chichester. Some scholars referred to this place in western Iran as Lake Urmia which some Lake Hamoon in the East. So a few in the city of Ray. They know near Tehran.
Kianid Dynasty's Region:
King Gashtasb Kiani was the greatest religious aide and believer who adopted his religion. The reign of the Kianid dynasty goes back more than three thousand years. Farshushar and Khamasab, who prominent in the Hugo dynasty, were one of Zoroaster’s closest companions. It seems that after the death of Zarathustra that he becomes the leader of his followers.