With the death of the Abu Hashim this party passed over to the service of the ʿAbbasids to whom it was a source of great strength, and at their accession to the Khalifate it ceased to exist as a sect. The most important sect, or group of sects, of the Shiʿites was (ii.) the faction which recognised Husayn as the third Imam, and his son, ʿAli Zayn al-Abidin (d. 94 A.H.) as his successor, the son of the Imam and of the royal princess of Persia. But at al-Abidin’s death this party split into two, some following his son Zayd (d. 121), others his son Muhammad al-Bakir (d. 113). The former or Zaydite party established itself for a considerable period in North Persia, and still maintains itself in South Arabia. Zayd himself was the friend and pupil of the Muʿtazilite or rationalist leader Wasil ibn ʿAta, and the Zaydites have generally been regarded as more or less free thinkers. The majority of the Shiʿites, however, recognised Muhammad al-Bakir as the fifth Imam, and after his death Jaʿfar as-Sadiq (d. 148) as the sixth, though here again there was a schism, some regarding Abu Mansur, another son of Muhammad al-Bakir, as the sixth Imam. Abu Mansur seems to have been one of the first ʿAlids to endorse the divine rights claimed for them by their followers, and did so in an extreme form, asserting that he had ascended to heaven and obtained supernatural illumination. At this time all the extremer Shiʿites regarded the Imam as an incarnation of the Divine Spirit passed on from ʿAli, and many believed that ʿAli was the true prophet of God whose office had been fraudulently intercepted by Muhammad. The Mansuris, however, were a minor sect, the majority of the Shiʿites followed Jaʿfar who was Imam at the time of the ʿAbbasid revolution. He was one of those who were deeply influenced by the traditions of Hellenistic philosophy and science, and was the author of works on chemistry, augury, and omens: he is usually credited with being the founder, or at least the chief exponent, of what are known as _batinite_ views, that is to say, the allegorical interpretation of the Qurʾan as having an esoteric meaning, which can only be learned from the Imam who is illuminated by divine wisdom, and who alone is able to reveal its true sense. The inner meaning thus revealed was usually a more or less imperfect reproduction of Aristotelian doctrine as it had been handed down by the Syriac writers. Like his brother, Abu Mansur Jaʿfar fully endorsed the doctrine of a divine Imamate and the transmigration of the Divine Spirit, then tabernacled in himself, and it seems probable that Van Vloten (_Recherches sur la domination arabe_, 1894, pp. 44-45) is right in suggesting that the general promulgation of these beliefs amongst the Shiʿites was largely due to the labours of the Hashimite missionaries.