Siavash, the son of Kay Kāvus the foolish king, after birth had brought up by Rostam in Zabol where he learned the customs of the warrior, culture, and fighting. The time he came back home, Sudabah, the seductive stepmother, falls in love with Siavash; But he, who has learned modesty and chastity does not indulge in sin. When she failed, accused him of attacking her and causing a miscarriage of twins. Unable to determine who was telling the truth, Kaus the king ordered Siavash to undergo trial by fire.

"I have dishonored: such a state is ruin. If I am innocent I shall escape. …”, said Siavash.

Siavash passed through the fire to prove his innocence and emerges proud from the fire court.