But though the party of Ali might regard the descendants of Ali as semi-divine, yet their conspiracies and revolts were uniformly unsuccessful, and it became a very dangerous thing to head one. The party was willing to get up a rising at any time, but the leader was apt to hang back. In fact, one of the most curious features of the whole movement was the uselessness of the family of Ali and the extent to which they were utilized by others. They have been, in a sense, the cat’s-paws of history. Gradually they themselves drew back into retirement and vanished from the stage, and, with their vanishing, a new doctrine arose. It was that of the hidden Imam. We have already seen the case of Muhammad ibn al-Hanafiya, whom Muslims reckon as the first of these concealed ones. Another descendant of Ali, on another line of descent, vanished in the same way in the latter part of the second century of the Hijra, and another about A.H. 260. Their respective followers held that they were being kept in concealment by God and would be brought back at the appointed time to rule over the world and bring in a kind of Muslim millennium. This is the oriental version of the story of Arthur in Avalon and of Frederick Barbarossa in Kyffhaüser. But that has led us far away and we must go back to the fall of the Umayyads and the again disappointed hopes of the Alids. By the time of the last Khalifa of the Umayyad house, Marwan II, A.H. 127-132 (A.D. 744-750), the whole empire was more or less in rebellion, partly Shi‘ite and partly Kharijite. The Shi‘ites themselves had, as usual, no man strong enough to act as leader; that part was taken by as-Saffah, a descendant of al-Abbas, an uncle of Muhammad. The rebellion was ostensibly to bring again into power the family of the Prophet, but under that the Abbasids understood the family of Hashim, while the Alids took it in the more exact sense of themselves. They were made a cat’s-paw, the Abbasid dynasty was founded, and they were thrown over. Thus, the Khalifate remained persistently in the hands of those who, up to the last, had been hostile to the Prophet. This al-Abbas had embraced the faith only when Mecca was taken by the Muslims. Later historians, jealous for the good name of the ancestor of the longest line of all the Successors, have labored to build up a legend that al-Abbas stayed in Mecca only because he could there be more useful in the cause of his nephew. This is one of the perversions of early history of which the Muslim chronicles are full. [Sidenote: UMAYYADS OF SPAIN]