It has before been mentioned that Al Mansur, disregarding the promise of pardon he had made to his uncle, Abdallah Ibn Ali, who had revolted against him, cast him into prison, where he remained a long time. When the Caliph set out on the pilgrimage to Mecca, he committed Abdallah to the care of Isa Ibn Musa, with private orders to put him to death. Isa, not wishing to kill Abdallah, contented himself with concealing him, sending a message to the Caliph to say that he had been put to death. This rumor spread about, and the Alides, the partisans of Abdallah, petitioned Al Mansur on the subject. The Caliph declared that he had been committed to the care of Isa. The Alides then went to Isa, and hearing from him that Abdallah had been put to death, came again with complaints to Al Mansur. The latter feigned to be in a rage, and exclaimed: "Since Isa has killed my uncle without my authorizing him to do so, he shall perish in his turn." The Caliph secretly desired that Isa should have perpetrated this murder, so that he might have a reasonable pretext for killing him, and thus ridding himself of two enemies at once. He accordingly sent for Isa, and said, "Is it true that you have killed my uncle?" "Yes," replied Isa; "you yourself ordered me to do so." "I never gave such an order!" cried the Caliph. "My lord, here is the letter you sent me." "I never wrote it," said Mansur. Isa, seeing the mood the Caliph was in, and fearing for his own life, confessed at last that the prisoner had been spared, and was in safe-keeping. The Caliph then ordered him to hand Abdallah over to the keeping of Abou 'l Azhar, which was accordingly done, and Abdallah remained in prison till his death was decided on. When Abou 'l Azhar came to execute the sentence, he found Abdallah with one of his female slaves. He strangled him first, but when he was proceeding to strangle the slave also, she cried out: "Servant of God, I pray thee for another kind of death." "It was the only time," Abou 'l Azhar said, "that I felt pity in carrying out a death-sentence. I turned away my eyes while I gave the order to kill her. She was strangled and placed by the side of her master. I then had the house demolished, and they remained buried in the ruins." Al Mansur visited Medina, and said to his chamberlain, Ar-Rabi, on entering the city: "Find me some learned and intelligent person who can point out to me the chief mansions of the place: it is now so long since I saw the dwellings of my family." An intelligent youth was discovered by Ar-Rabi, and presented to the Caliph. During their excursion the guide did not make any observations unless asked by Al Mansur to do so, but he then proceeded with great precision and eloquence to furnish every requisite information.