On one of these journeys, chancing to have fallen a little in the rear of his caravan, he heard roarings and trampling of horse's hoofs in the thicket close by the roadside. Drawing his sword, which he wore on account of thieves, he entered the thicket. On a little green, surrounded by trees, he saw a horseman in a light blue mantle and a turban fastened by a flashing diamond. The horse, an Arab of purest blood, seemed to have lost its senses. Rearing upright with a piercing neigh, it struggled vainly to dislodge an enormous panther, which had fixed its great claws in its flanks. The rider had lost all control over it; blood and foam poured from its mouth and nostrils. Kalif sprang boldly out, with a mighty stroke split the panther's skull, and, flinging away his sword, ran to the horse's head, thereby enabling the rider to dismount. Having calmed the trembling animal, the horseman begged his rescuer to follow him. "I had lost my way in the chase," he said, "and should have fallen a victim to the panther, if Allah had not sent you to my aid. I will reward you well for your bravery. Come! let us seek my companions; there, behind that wood, my camp must be." "I did what any other would have done in my place," answered Kalif simply, "and expect no reward. But if you so will it, I will accompany you to your tents." The stranger took his horse by the rein, and walked in silence at the merchant's side till they arrived at an opening in the trees. Here, surrounded by several smaller ones, stood one large tent of purple linen. A number of richly clad men threw themselves on their faces before the new-comer. Then Kalif knew whom he had saved: it was the Shah himself. He was about to fall at his feet, but the Shah seized his hand and led him into the tent. Inside, standing on five stools, were five caskets, the first of gold set with jewels, the second of gold alone, the third silver, the fourth copper, and the fifth of iron. "Choose one of these caskets," said the Shah. Kalif hesitated. At length he said: "What I did is not worthy of any reward, but if you will it, O King of Kings, I will take one of these caskets to remind me of the day when my eyes were permitted to behold the Light of Asia." He stooped and took the iron casket.