Year 298 (= A.D. 910). Abu ʿAbdullah had proved himself a loyal and efficient helper, and had done more than any other to establish the Mahdi in Africa. It seems that he was a sincere Shiʿite, and acted throughout in perfect good faith and in attachment to the Mahdi with whom he had corresponded, but probably had never seen before he entered the prison at Sijilmasa. In 298 these feelings changed. One account is that Abu ʿAbdullah and the chiefs of the Katama began to feel doubts about the Mahdi’s claim because he proved unable to work any miracles, and ability to perform miracles had always been assumed as one of the evidences of a Mahdi’s claims. Working miracles always has been and still is the primary essential of a _murabit_ (marabout) in North Africa, and there need be no reason to doubt that the non-fulfilment of the probably extravagant Berber expectations must have caused serious disappointment amongst the Katama. Then again, the Berbers, like the Arabs, are naturally fickle and insubordinate; in the ordinary course of things they would be sure to murmur before long against any ruler, especially against one near at hand. Did Abu ʿAbdullah share their feelings? or did he excite them for his own ends? Ibn Khallikan states that when the Mahdi was firmly established at Kairawan, Abu l-ʿAbbas reproached his brother that “You were master of the country and uncontrolled arbiter of its affairs, yet you have delivered it over to another and consent to remain in the position of an inferior,” and at this Abu ʿAbdullah began to regret that he had handed everything over to the Mahdi and commenced plotting against him (Ibn Khall. i. 465). But it must be remembered that Ibn Khallikan shows a very marked anti-Fatimid bias. It seems more likely that both Abu ʿAbdullah and the Berbers were really disappointed to find the Mahdi an ordinary mortal. The matter was debated in the presence of the chief sheikh of the Katama, and Abu ʿAbdullah expressed his doubts, saying: “His actions are not like those of the Mahdi to whom I used to try to win you: I am afraid I have been mistaken in him, and have suffered a delusion similar to that of Ibrahim al-Khalit when the night closed over him and he saw a star and said, ‘This is my lord’ (Qur. vi. 76). It is therefore incumbent on me and you to examine him, and to make him show those proofs which are known to the genealogists as those to be found in the Imam” (Arib b. Saʿid, _Nicholson_, pp. 120-121). As a result the Sheikh of the Katama waited upon ʿUbayd Allah and asked for the performance of a miracle as a proof of his claim to be the Mahdi. The reply was the immediate execution of the Sheikh. This gave serious alarm to Abu ʿAbdullah and his brothers, who held a meeting by night in the house of the youngest brother Abu Zakir. This night meeting may have been merely a conference to discuss changed conditions, or it may have been in the nature of a conspiracy. Such meetings continued for some time, and