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Occultation (Arabic:غيبة,ghayba) inShia Islam refers to theeschatological belief that theMahdi, a descendant of the Islamic prophetMuhammad, has already been born and he was subsequently concealed, but he will reemerge and he will establish justice and peace on earth at the end of time.[1] The signs of his (re)appearance are largely common in Shia andSunni[2][3] (although Sunni do not believe the Mahdi has already been born and is in occultation),and the belief in the eschatological Mahdi remains popular among all Muslims, possibly owing to numerous traditions to this effect in canonical Sunni and Shia sources.[2]
However, thebranches of Shia Islam that believe in it differ with regard to the identity of the Mahdi. Themainstream Shia identifies him asMuhammad al-Mahdi, the twelfth imam,[2] who is believed to be responsible for the affairs of men and, in particular, their inward spiritual guidance during the occultation.[4][5]

Twelver Shia is the mainstream branch of Shia Islam, accounting for 85 percent of the Shia population.[6] The Twelvers believe that their twelfth Imam,Muhammad al-Mahdi, is in occultation. During hisMinor Occultation (874–941), the twelfth Imam is believed to have remained in regular contact with four successive agents,[7] collectively known as theFour Deputies (al-nuwwab al-arba').[8] During theMajor Occultation (941–present), however, there is no agent of the Hidden Imam on earth,[7] though it is believed that he remains providentially living in his physical body until his reappearance in the end of time.[9]
The Twelver theory of occultation crystallized in the first half of the fourth (tenth) century based on rational and textual arguments.[10] This theory, for instance, sets forth that the life of Muhammad al-Mahdi has been miraculously prolonged, arguing that the earth cannot be void of the imam as the highest proof (hujja) of God. As another example, while the Abbasid threat might have initially forced the twelfth imam into occultation,[11] according to this doctrine, his absence continues until initial conditions are met for his reappearance, including humankind's readiness for the message of the Hidden Imam.[12]
Immediately after the death ofHasan al-Askari in 260 (873–874),[13]Uthman al-Amri (d. 874–875) claimed that the eleventh Imam had a young son, named Muhammad, who had entered a state of occultation due to the threat to his life from the Abbasids.[11] As the special representative of al-Askari, Uthman also claimed that he had been appointed to represent the son of the eleventh Imam.[14] Possibly the only public appearance of Muhammad was to lead the funeral prayer for his father instead of his uncle,Ja'far.[15][16]
In his new capacity, Uthman received petitions and made available their responses, sometimes in writing.[17] As the closest associate of al-Askari,[18] most of al-Askari's local representatives continued to support Uthman.[19] He later introduced his son,Abu Ja'far Muhammad ibn Uthman (d. 916–17), as the next representative of al-Mahdi.[20][21] In turn, as his replacement, Abu Ja'far nominatedAbu al-Qasim al-Husayn ibn Ruh al-Nawbakhti (d. 937–38).[22]
This period, later termed theMinor Occultation (al-ghaybat al-sughra),[23] ended after about seventy years with the death of the fourth agent,Abu al-Hasan Ali ibn Muhammad al-Samarri (d. 940–41),[24] who is said to have received aletter from al-Mahdi shortly before his death.[20] The letter predicted the death of Abu al-Hasan in six days and announced the beginning of the complete (tamma) occultation,[25][8][24] later called theMajor Occultation (al-ghaybat al-kubra).[23] The letter, ascribed to al-Mahdi, added that the complete occultation would continue until God granted him permission to manifest himself again in a time when the earth would be filled with tyranny.[25] This and similar letters to the four agents and other Shia figures are said to have had the same handwriting, suggesting that they were written by the Hidden Imam.[26]
The Major Occultation, a later term, began with the death of the fourth agent in 329 (940–941), who did not designate a successor. In this period, which continues today, there is no agent of the Hidden Imam on earth.[25][27] There were likely early traditions among the Shia that had already predicted the two periods of occultation.[28] These hadiths were previously cited, for instance, by theWaqifites in reference to the two arrests ofMusa al-Kazim, the seventh Imam.[2][28]
In the absence of the Hidden Imam, the leadership vacuum in the Twelver community was gradually filled by the jurists in their new capacity as general deputy (na'ib al-amm) to the Hidden Imam. It is also popularly held that the Hidden Imam occasionally appears to the pious in person or, more commonly, in dreams and visions. The accounts of these encounters are numerous and widespread among the Twelvers.[29][30][9][31]
Isma'ili Shia branched off from mainstream Shia over the succession ofIsma'il, who predeceased his father,Ja'far al-Sadiq, the sixth imam.[32] This group either believed that Isma'il was still alive but in concealment or instead recognized the imamate of Isma'il's son,Muhammad, and his descendants.[33][34][35] Today, Isma'ilis are divided into two groups,Nizari andMusta'li. The Nizarite imam is the presentAga Khan V, their fiftieth imam in the line of succession. The Musta'lis, however, believe that their twenty-first imam and his progeny went into occultation.[36] In the absence of their imam, Musta'lis take guidance from Da'i al-Mutlaq (lit. 'supreme authority'). Different branches of Musta'li Shia differ on who the currentDa'i al-Mutlaq is.[37]
Before the rise of theFatimid Caliphate, as a major Isma'ili Shia dynasty,[38] the terms Mahdi and Qa'im were used interchangeably for the messianic imam anticipated in Shia traditions. With the rise of the Fatimids in the tenth century CE, however,al-Qadi al-Nu'man argued that some of these predictions had materialized by the first Fatimid caliph,Abdallah al-Mahdi Billah, while the rest would be fulfilled by his successors. Henceforth, their literature referred to the awaited eschatological imam only as Qa'im (instead of Mahdi).[2]
InZaydi view, imams are not endowed with superhuman qualities, and expectations for their mahdiship are thus often marginal.[2][39] One exception is the extinct Husaynites inYemen, who denied the death of al-Husayn ibn al-Qasim al-Iyani and awaited his return.[2]
Historically, various Muslim figures were identified with the eschatological Mahdi or used the name as an honorific title with messianic significance. These include the UmayyadUmar II and the Abbasidal-Mahdi, among many others.[2] Similarly, mahdism and occultation are recurring themes in the history of Shia.[40] For instance, long-standing Shia traditions were appropriated by the now-extinctWaqifites to argue thatMusa al-Kazim, the seventh imam, had not died but was in occultation.[41] Even earlier, the now-extinctKaysanites denied the death ofMuḥammad ibn al-Hanafiyya and awaited his return as the Mahdi.[2][42] TheQarmatians, an extinct branch of Isma'ili Shia, believed in the mahdiship ofMuhammad ibn Isma'il and his imminent return.[43][44] Similar figures in Shia history areMuhammad al-Nafs al-Zakiyya,Muhammad ibn Qasim al-Alawi,Yahya ibn Umar, andMuhammad ibn Ali al-Hadi.[40]
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