collapse of the political ambitions of the people of Hejaz and Iraq. Kasaniyya is a name given to all sects originated from Mokhtar's revolt who trace the imamate through Muhammad ibn al-Hanafiyyah and his successors. The Kaysaniyya itself is divided to different sects, though its common view is that Hasan, Husayn, and Ibn Hanfiyyah were the true successors of Ali. However, some extreme sects within the Kaysaniyya reject the imamate of Hasan and Husayn. When Ibn Hanafiyyah died in 81 AH, some of his followers, who became known as the Karbiyya, came to believe that Ibn Hanafiyyah had not died but was in concealment at a mountain near Medina, and would reappear again as Mahdi to fill the earth with justice. Another group, called the Hashemiyya, admitted that Ibn Hanafiyya was dead and followed his son, Abu Hashim. All Keysaniyya sects are distinguished by the love for Ali and his family and the hatred for ruling dynasty. According to Kohlberg, when Ibn Hanafiyya died, some Kaysanites joined Zayn al-Abidin. It was around this time that the doctrine of , i.e., the Imam's explicit designation of his successor, found its modern importance in the Shia jurisprudence (). Family Ali ibn al-Husayn is said to have between eight and fifteen children, of whom four sons were born to Umm Abd Allah Fatima bint Hasan and the others were from concubines. According to Chittick, Zayn al-Abidin fathered fifteen children, eleven boys and four girls. Al-Shaykh al-Mufid reports their names as Muhammad al-Baqir, Zayd, Hasan, Husayn al-Akbar, Husayn al-Asghar, Abd Allah, Abd al-Rahman, Sulayman, Muhammad al-Asghar, Umar al-Ashraf, Ali, Umm Kulthum, Khadija, Fatima and Aliyya. Death Zayn al-Abidin is said to have been poisoned in Medina at the instigation of the reigning Umayyad caliph, al-Walid, or his brother, Hisham. The year of his death is reported as 94 AH (712 CE) or 95 (713) and he is buried next to his uncle, Hasan, in the al-Baqi' cemetery in Medina. According to Madelung, after his death, many people discovered that their livelihoods had come from Ali. He would go out every night with a sack of food on his back, knocking at the doors of the poor, and gave freely to whoever answered while covering his face to remain anonymous. Successor According to Jafri, it is widely reported that Zayn al-Abidin designated his eldest son, Muhammad al-Baqir, as the next Imam before his death. Zayd,