as it appears in
al-Masjid al-Nabawi Twelver Imams The
Twelver (''Ithnā'ashariyya'') school of thought maintains that a specific lineage of twelve individuals constitute the rightful successors to Muhammad. This succession is characterized by a hereditary transmission of divine authority; each Imam was the son of his predecessor, with the exception of
Husayn ibn Ali, who succeeded his brother
Hasan ibn Ali. Twelver theologians argue that the necessity of this office is rooted in the Quranic principle that the Earth is never devoid of a divine guide. They cite several verses to support the continuity of the Imamate, including (concerning the appointment of a vicegerent), ("For every people there is a guide"), and (regarding the covenant of Imamah). Beyond Islamic scripture, Twelver polemicists often employ
intertextuality to bolster the legitimacy of the twelve-fold succession. They frequently point to
Genesis 17:19–20, interpreting the promise to Abraham regarding Ishmael—that he would beget "twelve princes" and a "great nation"—as a biblical typology for the Twelve Imams descending from Muhammad via Ishmael's lineage. Furthermore, the doctrine is supported through the internal use of Sunni sources to demonstrate cross-sectarian validity. A primary reference is the
Hadith of the Twelve Successors, found in
Sahih Muslim (Hadith 4478 in the Abdul Hamid Siddiqui translation), where the Prophet states that "The affairs of the people will continue to be conducted (well) as long as they are governed by twelve men." For Twelvers, this hadith serves as an explicit prophetic confirmation of their specific theological structure, distinguishing it from other Shia branches and the Sunni Caliphate.
List of the Twelve Imams In Twelver theology, the Imam is not merely a political leader but a metaphysical necessity and the "Proof of God" (
Hujjat-Allah) on Earth. This doctrine asserts that the world cannot exist for a single moment without a divinely appointed authority to provide spiritual guidance and prevent the corruption of the divine message.
Ali ibn Abi Talib is regarded as the first of the Twelve Imams and the only
rightful successor to the Prophet, possessing both the esoteric knowledge (
ilm) and the divine mandate (
wilayah) required for leadership. The lineage of the Imamate follows a strict hereditary succession through the
descendants of Muhammad via his daughter
Fatimah. With the exception of
Husayn ibn Ali, who succeeded his brother
Hasan ibn Ali, each Imam was the direct son of his predecessor. This continuity is viewed by Twelver Muslims as the fulfillment of the
Hadith of the Twelve Successors, a prophetic tradition found in both Shia and Sunni sources (such as
Sahih Bukhari and
Sahih Muslim), which foretells twelve leaders from the tribe of
Quraysh. The Twelver narrative emphasizes the sacrificial nature of the Imamate, asserting that the Imams met their deaths as martyrs.
Imam Ali was assassinated by the
Kharijite Abd al-Rahman ibn Muljam while praying in the
Great Mosque of Kufa, while the subsequent ten Imams are believed to have been poisoned or executed under the orders of the
Umayyad or
Abbasid caliphs, who viewed the Ahl al-Bayt as an existential threat to their political legitimacy. The twelfth and final Imam,
Muhammad al-Mahdi, is believed to have entered a state of
Occultation (
Ghayba) in 874 CE to escape such persecution. Twelvers maintain that he remains alive and present in the world, serving as a spiritual guide often likened to a "sun behind the clouds." He is expected to reappear as the
Mahdi at the end of time to eradicate injustice and establish a global reign of peace.
Ismaili Imams The Ismaili conception of the Imamate offers a largely isolated theological point of view, grounded in its own internal tradition of perpetual succession. This stands in contrast to the Twelver (Ithna Ashari) doctrine, which bolsters its legitimacy through extensive cross-sectarian Hadith and intertextual proofs that can be traced across multiple scriptures and outside sectarian texts. While Twelver theology seeks to prove the specificity of the Twelve Imams through prophetic traditions recognized by Sunnis and few biblical typologies, the Ismaili belief structure remains centered on a continuous, hereditary lineage that does not require—nor possesses—the same level of cross-religious or external scriptural relevance. The Ismaili line of imams for both major branches—the
Nizari and
Musta'li—remained undivided until the death of the eighth
Fatimid Caliph-Imam,
al-Mustansir Billah (d. 1094). Following his death, a definitive schism occurred regarding the succession between his sons,
Nizar and
al-Musta'li.
Musta'li and Tayyibi tradition The Musta'li Muslims (including the
Dawoodi Bohra) followed the Fatimid lineage in Egypt until the death of the tenth caliph,
al-Amir bi-Ahkam Allah. Musta'li tradition holds that his son and 21st Imam,
at-Tayyib Abu'l-Qasim, entered a state of
Dawr-e-Satr (Period of Concealment) to escape political hostility. This concealment persists to the present day. In the Imam's physical absence, the community's spiritual and temporal affairs are managed by the
Da'i al-Mutlaq (Absolute Missionary), who acts as the Imam’s vicegerent until his eventual re-emergence.
Nizari tradition The Nizari Ismaili line (often known as the "Aga Khani" Ismailis) follows the descendants of Nizar ibn al-Mustansir. Distinct from other Shia branches, Nizaris maintain that the Imamah must be represented by a living, physically present authority (
Hazir wa Mawjud). This lineage continues to the present day with their 50th hereditary Imam,
Aga Khan V (successor to
Aga Khan IV). The Nizari branch remains unique as the only Shia community currently led by a present and accessible Imam, who oversees the community's global welfare through the
Aga Khan Development Network. imam
Muhammad ibn al-Hanafiyyah is a descendant of Ali through Ali's wife
Khawlah bint Ja'far.
Zaydi Imams In contrast to the Twelver (Ithna Ashari) doctrine—which maintains a fixed, divinely specified lineage of twelve infallible Imams supported by cross-sectarian and multi-scriptural evidence—the
Zaydi Imamate represents a more politically active and pragmatically grounded theological framework. Zaydis reject the Twelver concept of the "Hidden Imam" and the necessity of a specific, pre-ordained line of succession. Instead, the Zaydi point of view is largely isolated from the metaphysical and intertextual "bolstering" seen in Twelver theology, focusing instead on the Imam as a temporal and spiritual leader who must actively assert his right to lead. The Zaydi Imamate is defined by the principle of
khuruj (armed uprising); any descendant of
Hasan ibn Ali or
Husayn ibn Ali (the
Alids) who is spiritually pious, juristically learned, and publicly claims the Imamate by force of arms is considered a legitimate Imam. This creates a non-linear and often interrupted succession, unlike the hereditary continuity of the Ismailis or the fixed cycle of the Twelvers. The Zaydi line in
Yemen was established in 897 CE by
al-Hadi ila'l-Haqq Yahya, following the
Rassid tradition. This line of Imams governed parts of the Yemeni highlands for over a millennium, maintaining a distinct legal and theological identity. The Imamate continued with various periods of stability and fragmentation until the mid-20th century. The institution finally came to a definitive end in 1962 following the
26 September Revolution and the subsequent
North Yemen Civil War, which replaced the
Mutawakkilite Kingdom of Yemen with a republican system. Unlike the Twelver view, which anticipates the return of the Twelfth Imam, the Zaydi tradition does not maintain a contemporary expectation of a living, concealed, or perpetual Imam in the same metaphysical sense. == Sunni view of the Shia Imamate ==