The armies met and the great battle began. Sohrab asked to have Rustem pointed out to him, but the soldiers on his side were all instructed to keep him in ignorance. By some strange mischance the two men whom his mother had sent to enlighten him, were both slain. Rustem was moved at the sight of the brave young warrior, but remembering that Tahmineh's offspring was a daughter, thought nothing more of the thrill he felt at sight of him. At last Sohrab and Rustem met in single combat. Sohrab was moved with tenderness for his unknown opponent, and besought him to tell him if he was Rustem, but Rustem declared that he was only a servant of that chief. For three days they fought bitterly, and on the fourth day Rustem overthrew his son. When Sohrab felt that the end had come he threatened his unknown opponent. "Whoever thou art, know that I came not out for empty glory but to find my father, and that though I have found him not, when he hears that thou hast slain his son he will search thee out and avenge me, no matter where thou hidest thyself. For my father is the great Rustem."
Rustem fell down in agony when he heard his son's words, and realized that his guile had prevented him from being made known the day before. He examined the onyx bracelet on Sohrab's arm; it was the same he had given Tahmineh. Bethinking himself of a magic ointment possessed by Kai-Kaus, he sent for it that he might heal his dying son; but the foolish king, jealous of his prowess, refused to send it, and Sohrab expired in the arms of his father.
Rustem's heart was broken. He heaped up his armor, his tent, his trappings, his treasures, and flung them into a great fire. The house of Zal was filled with mourning, and when the news was conveyed to Samengan, he tore his garments, and his daughter grieved herself to death before a year had passed away.
To Kai-Kaus and a wife of the race of Feridoun was born a son called Saiawush, who was beautiful, noble, and virtuous. But his foolish father allowed himself to be prejudiced against the youth by slanderous tongues, so that Saiawush fled from the court and sought shelter with Afrasiyab in Turan. There he speedily became popular, and took unto himself for a wife the daughter of Afrasiyab. But when he and Ferandis his wife built a beautiful city, the hatred and jealousy of Gersiwaz was aroused, so that he lied to Afrasiyab and said that Saiawush was puffed up with pride, and at last induced Afrasiyab to slay his son-in-law.
Saiawush had a son, Kai-Khosrau, who was saved by Piran, a kind-hearted nobleman, and given into the care of a goatherd. When Afrasiyab learned of his existence he summoned him to his presence, but the youth, instructed by Piran, assumed the manners of an imbecile, and was accordingly freed by Afrasiyab, who feared no harm from him.
When the news of the death of Saiawush was conveyed to Iran there was great mourning, and war was immediately declared against Turan. For seven years the contest was carried on, always without success, and at the end of that time Gudarz dreamed that a son of Saiawush was living called Kai-Khosrau, and that until he was sought out and placed at the head of the army, deliverance could not come to Iran. Kai-Khosrau was discovered, and led the armies on to victory; and when Kai-Kaus found that his grandson was not only a great warrior, skilled in magic, but also possessed wisdom beyond his years, he resigned the throne and made Kai-Khosrau ruler over Iran.
Kai-Khosrau ruled many long years, in which time he brought peace and happiness to his kingdom, avenged the murder of his father, and compassed the death of the wicked Afrasiyab. Then, fearing that he might become puffed up with pride like Jemschid, he longed to depart from this world, and prayed Ormuzd to take him to his bosom.
The king; after many prayers to Ormuzd, dreamed that his wish would be granted if he set the affairs of his kingdom in order and appointed his successor. Rejoiced, he called his nobles together, divided his treasure among them, and appointed his successor, Lohurasp, whom he commanded to be the woof and warp of justice. Accompanied by a few of his faithful friends, he set out on the long journey to the crest of the mountains. At his entreaties, some of his friends turned back; those who stayed over night, in spite of his warnings, found on waking that they were covered by a heavy fall of snow, and were soon frozen. Afterwards their bodies were found and received a royal burial.
Lohurasp had a son Gushtasp who greatly desired to rule, and was a just monarch, when he succeeded to the throne. Gushtasp, however, was jealous of his son, Isfendiyar, who was a great warrior. When Gushtasp was about to be overcome by the forces of Turan, he promised Isfendiyar the throne, if he would destroy the enemy; but when the hosts were scattered, and Isfendiyar reminded his father of his promise, he was cast into a dungeon, there to remain until his services were again needed. When he had again gained a victory, he was told that the throne should be his when he had rescued his sisters from the brazen fortress of Arjasp, where they had been carried and imprisoned.
On his way to this tower Isfendiyar met with as many terrible foes as Rustem had encountered on his way to the White Deev, and as successfully overcame them. Wolves, lions, enchantresses, and dragons barred the way to the impregnable fortress, which rose three farsangs high and forty wide, and was constructed entirely of brass and iron. But Isfendiyar, assuming the guise of a merchant and concealing his warriors in chests, won his way into the castle, gained the favor of its inmates, and made them drunk with wine. This done, he freed his sisters, slew the guards, and struck down Arjasp.