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However, the Umayyads in charge of the various governments would not accept this arrangement and rose up in rebellion; eventually, 'Ali would be forced to flee Medina and settle in Kufa in Iraqcentral Iraq would become the center of Shi'a Islam for several hundred years. 'Ali would eventually have to contend with dissension in his own army while fighting the Umayyads; after defeating these dissenters in battle, he would be assassinated a few years later by one of them in revenge for this defeat.
From this point onwards, authority was divided in the Islamic world. The Umayyads continued to pass the Caliphate down through the ages among their family; but their now existed in Iraq a separate Islamic community that did not recognize the authority of the Umayyad Caliphs. Rather they recognized only the successors to 'Ali as authorities, and they gave these successors the title Imam, or spiritual leader of Islam, both to differentiate their leaders from the more worldly and secular Umayyads and because Abu Muhammed Hasan ibn 'Ali, the second Imam, ceded the Caliphate to the Umayyads. A grand total of ten Imams succeeded 'Ali, passing the Imamate down to their sons in hereditary succession. However, the eleventh Imam, Hasan al-Askari, died without a son, and the Shi'ites were thrown into disarray. Shi'a Islam divided into several different sects, the most important of which was the Qat'iyya ("those who are certain"). The Qat'iyya believed that Hasan al-Askari did indeed have a son, Muhammed al-Mahdi; one of the Qat'iyya sects believed that Muhammed al-Mahdi, the twelfth Imam, had hidden himself and remained in hiding. This sect was called Ithna-'Ashari (Twelver) or Imami (Imam) Shi'a, and was the form of Shi'a that eventually came to exclusively represent Shi'ism.
The Imamate is the central aspect of Shi'ite Islam. At no time in human history has the world been bereft of an Imam who serves as both a guide (Hadi ) to humans and a Proof of God (Hujjat Allah ) and a Sign of God (Ayyat Allah ). The Imams span history from Adam to the present day; the Imams, according to Shi'ites, were a light created before the creationthis light was the instrument of creation. The Imam has secret knowledge of God and creation; the most important of these secrets is "The Greatest Name of God." The Imams are designated or appointed by God (mansus ), they are free from all sin or fault (ma'shum ), and they are the most perfect of humans (afdal an-nas ). But above all, the Imam is the one who teaches human beings the mystical truths of the universe; it is throught the Imam that the esoteric, mystical aspects of God are transmitted to human beings.
However, in Twelver Shi'a, the twelfth Imam, Muhammed al-Mahdi, hid himself way as a boy when his father, the Imam Hasan al-Askari, died in 874 A.D.. This, in Shi'a, is called the doctrine of "occultation" (ghayba ). He hid himself in a well within a cave because of the threats to his life by his enemies, and remained in communication with the "four agents," each succeeding the other, until 941. This period, in which the Hidden Imam was in contact with the rest of humanity through these agents who passed on the Imam's messages to the world, is called the Lesser Occultation. However, starting in 941, the Hidden Imam ceased communicating to humanity through these agents; this period in which the Hidden Imam, still alive and on earth, cuts of all communication with humanity is known as the Greater Occulation. However, at some point, Muhammed al-Mahdi, will return and reveal himself to humanity and appear again (zuhur ). With him will return from the dead all his enemies, and the Imam will lead the forces of righteousness against the forces of evil in one last battle after which will follow the Day of Judgement. At that point will return Jesus Christ and all the saints, prophets, and Imams of history; this, in Shi'a, is called the doctrine of Return (raj'a ).