Shi‘ite revolts against Abbasids; Idrisids; Zaydites; Imamites; the Twelvers; constitutional theory of modern Persia; origin of Fatimids; Maymun the oculist; plan of the conspiracy; the Seveners; the Qarmatians; Ubayd Allah al-Mahdi and founding of Fatimid dynasty in North Africa; their spread to Egypt and to Syria; al-Hakim Bi’amrillah; the Druses; the Assassins; Saladin and the Ayyubids. IT is not in place here to deal with all the numberless little Shi‘ite revolts against the Abbasids which now followed. Those only are of interest to us which had more or less permanent effect on the Muslim state and states. Earliest among such comes the revolt which founded the dynasty of the Idrisids. About the middle of the second century the Abbasids were hard pressed. The heavens themselves seemed to mingle in the conflict. The early years of their rule had been marked by great showers of shooting stars, and the end of the age was reckoned near by both parties. Messianic hope was alive, and a Mahdi, a Guided of God, was looked for. This had long been the attitude of the Alids, and the Abbasids began to feel a necessity to gain for their de facto rule the sanction of theocratic hopes. In 143 Halley's comet was visible for twenty days, and in 147 there were again showers of shooting stars. On the part of the Abbasids, homage was solemnly rendered to the eldest son of al-Mansur, the Khalifa p. 79) is held in especially high reverence, and one division of the Moorish army always carries a copy of it as a talisman. They are really a bit of the second