Aulad answered, "When the sun shall grow hot, the Genii will go to sleep. That will be your time to conquer them."

Rustem waited till the sun was at its highest, and then went forth to battle. The Genii that were on guard fled at the sound of his voice, and he went on without finding any to resist him till he came to the great cavern of which the King had spoken. It was a terrible place to see, and he stood for a while with his sword in his hand, doubting what he should do. No one would choose such a spot for battle; and as for escaping from it, that was beyond all hope. Long he looked into the darkness, and at last he saw a monstrous shape, which seemed to reach across the whole breadth of the cave. It was the White Genius that was lying asleep. Rustem did not attempt to surprise him in his sleep, but woke him by shouting his battle-cry. When the White Genius saw him, he rushed at once to do battle with him. First he caught up from the ground a stone as big as a millstone and hurled it at him. For the first time Rustem felt a thrill of fear, so terrible was his enemy. Nevertheless, gathering all his strength, he struck at him a great blow with his sword and cut off one of his feet. The monster, though having but one foot, leaped upon him like a wild elephant, and seized him by the breast and arms, hoping to throw him to the ground, and tore from his body great pieces of flesh, so that the whole place was covered with blood. Rustem said to himself, "If I escape to-day I shall live forever;" and the White Genius thought, "Even if I do deliver myself from the claws of this dragon, I shall never see Mazanderan again." Still he did not lose courage, but continued to struggle against the hero with all his might.

So the two fought together, the blood and sweat running from them in great streams. At last Rustem caught the Genius round the body, and, putting out all his strength, hurled him to the ground with such force that his soul was driven out of his body. Then he plunged his poinard into the creature's heart, and tore the liver out of his body. This done he returned to Aulad, whom he had left bound with his lasso, loosed him, and set out for the place where he had left the King. But first Aulad said to him, "I have the marks of your bonds upon me; my body is bruised with the knots of your lasso; I beseech you to respect the promise which you made me of a reward. A hero is bound to keep his word."

Rustem said: "I promised that you should be King of Mazanderan, and King you shall be. But I have much to do before my word can be kept. I have a great battle to fight, in which I may be conquered, and I must rid this country of the magicians with whom it is encumbered. But be sure that, when all is done, I will not fail of the promises which I have made."

So Rustem returned to King Kaoüs, and, dropping the blood of the White Genius into his eyes, gave him back his sight. Seven days the King and his nobles feasted together, Rustem having the chief place. On the eighth day they set out to clear the country of the accursed race of magicians. When they had done this, the King said, "The guilty have now been punished. Let no others suffer. And now I will send a letter to the King of Mazanderan."

So the King wrote a letter in these words: "You see how God has punished the wrong-doers—how he has brought to naught the Genii and the magicians. Quit then your town, and come here to pay homage and tribute to me. If you will not, then your life shall be as the life of Arzeng and the White Genius."

This letter was carried to the King by a certain chief named Ferbad. When the King had read it, he was greatly troubled. Three days he kept Ferbad as his guest, and then sent back by him this answer: "Shall the water of the sea be equal to wine? Am I one to whom you can say, 'Come down from your throne, and present yourself before me?' Make ready to do battle with me, for verily I will bring upon the land of Persia such destruction that no man shall be able to say what is high and what is low."

Ferbad hastened back to the King of Persia. "The man," he said, "is resolved not to yield." Then the King sent to Rustem. And Rustem said, "Send me with a letter that shall be as keen as a sword and a message like a thunder-cloud." So the King sent for a scribe, who, making the point of his reed as fine as an arrowhead, wrote thus: "These are foolish words, and do not become a man of sense. Put away your arrogance, and be obedient to my words. If you refuse, I will bring such an army against you as shall cover your land from one sea to the other; and the ghost of the White Genius shall call the vultures to feast on your brains."

The King set his seal to this letter, and Rustem departed with it, with his club hanging to his saddlebow. When the King of Mazanderan heard of his coming, he sent some of his nobles to meet him. When Rustem saw them, he caught a huge tree that was by the wayside in his hands, twisted it with all his might, and tore it up, roots and all. Then he poised it in his hand as if it were a javelin. One of the nobles, the strongest of them all, rode up to him, caught one of his hands, and pressed it with all his might. Rustem only smiled; but when in his turn he caught the noble's hand in his, he crushed all the veins and bones, so that the man fell fainting from his horse.

When the King heard what had been done, he called one of his warriors, Kalahour by name, the strongest man in his dominions, and said to him, "Go and meet this messenger; show him your prowess, and cover his face with shame." So Kalahour rode to meet Rustem, and, taking him by the hand, wrung it with all the strength of an elephant. The hand turned blue with the pain, but the hero did not flinch or give any sign of pain. But when in his turn he wrung the hand of Kalahour, the nails dropped from it as the leaves drop from a tree. Kalahour rode back, his hand hanging down, and said to the King, "It will be better for you to make peace than to fight with this lion, whose strength is such that no man can stand against him. Pay this tribute, and we will make it good to you. Otherwise we are lost."