Part 8 •Shahnameh•The book of kings 

Meanwhile Persia was filled with dissension and revolt; the bright day darkened and men broke faith with Jamshid. His divine farr grew dim, and he gave himself to evil and foolishness. Petty kings and their armies sprang up on all sides, every province produced its own claimant to the throne, and they felt no love for Jamshid. A contingent made their way to the Arab lands, where they had heard there lived a terrifying lord with a face like a serpent's. Seeking a king, Persia's horsemen approached Zahhak: they greeted him as a sovereign, hailing
him as the ruler of Iran. This serpentine creature came to Persia as quickly as the wind blows, and there set the crown on his head. From every province he gathered together an army of Persians and Arabs, and attacked Jamshid on his throne, drawing the noose tight about him.

Part 9 •Shahnameh•The book of kings 

Zahhak reigned for a thousand years, and from end to end the world was his to command. The wise concealed themselves and their deeds, and devils achieved their heart’s desire. Virtue was despised and magic applauded, justice hid itself away while evil flourished; demons rejoiced in their wickedness, while goodness was spoken of only in secret.
Two innocent young women were dragged from Jamshid’s house, trembling like the leaves of a willow tree; they were Jamshid’s sisters, the crown among his womenfolk. One of these veiled women was Shahrnavaz, and her chaste sister was Arnavaz. Zahhak trained them in magic and taught them evil ways, since he himself knew nothing but evil—murder, rapine, and the burning of cities.

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Meanwhile Zahhak reigned ever more cruelly. If a warrior had a beautiful daughter hidden away in his house, Zahhak would accuse him of consorting with demons and kill him, and have the girl brought to him as his slave. He acted without regard for the customs of kings or the laws of religion.