The Ismā'īlī Imāmah (Arabic: اٍمامة) doctrine; The Ismā'īlī Imāmate differ from Twelvers because they had living imams for centuries after the last Twelver Imam went into concealment. They followed Isma'il ibn Jafar, elder brother of Musa al-Kadhim, as the rightful Imam  after his father Ja'far al-Sadiq. The Ismailis believe that whether Imam Ismail did or did not die before Imam Ja'far, he had passed on the mantle of the imāmate to his son Muḥammad ibn Ismā'īl al-Maktum as the next imam.
The Seven Imāms
Main articles: Qarmatian
Qarmatian - Imamāte of Seven Imāms
According to Qarmatian imāmate the number of imāms are fixed as in Ithnā‘ashariyyah but it's Seven instead of Twelve. The imāmate of Qarmatian-Seveners is different than the current Mustaali-Tayyibi and Nizārī Ismā'īlī imāmates. The imāmate considers Muħammad ibn Ismā'īl al-Maktum - The founder of Ismā'īlīsm as The Mahdi in Ghaybah.
The Maymūnī-Ismā'īlī ʿAqīdah
According to Ismā‘īlīsm, Allah has sent "seven" great prophets known as “Nātıq” (Spoken) in order to disseminate and improve his Dīn of Islam. All of these great prophets has also one assistant known as “Sāmad (Silent) Imām”. At the end of each seven “Sāmad” silsila, one great “Nātıq” (Spoken) has ben sent in order to reimprove the Dīn of Islam. After Adam and his son Seth, and after six “Nātıq” (Spoken) – “Sāmad” (Silent) silsila (Noah–Shem), (Abraham–Ishmael), (Moses–Aaron), (Jesus–Simeon), (Muhammad bin ʿAbd Allāh–Ali ibn Abu Tālib); the silsila of “Nātıqs and Sāmads have been completed with (Muhammad bin Ismā‘īl as-ṣaghīr (Maymûn’ûl-Qaddāh)–ʿAbd Allāh Ibn-i Maymûn and his sons).
The First Seven Mustā‘lī and Nizārī Ismā'īlī imāms
Tāyyībī-Mustā‘lī and Nizārī Ismā'īlī imāms
The line of common Nizārī and Mustā‘lī Ismā'īlī imāms is as follows (the years of their individual imamātes during the Common Era are given in brackets):
Further information: Fatimids
, Imamate (Nizari Ismaili Doctrine)
, Dawoodi Bohra
, Alavi Bohra
, Hebtiahs Bohra
, Progressive Dawoodi Bohra
and Qutbi Bohra
İsmaili imāms after Muħammad ibn Ismā'īl al-Maktum
- ^ Rise of The Fatimids, by W. Ivanow. Page 81, 275
- ^ THE IMAMATE IN ISMAʿILISM
- ^ MUHAMMAD BIN ISMAIL (158-197/775-813)
- ^ Encyclopedia Iranica, DAWR (1)
- ^ Öz, Mustafa, Mezhepler Tarihi ve Terimleri Sözlüğü (The History of madh'habs and its terminology dictionary), Ensar Yayıncılık, İstanbul, 2011. (This is the name of the trainer of Muhammed bin Ismā‘īl ibn Jā’far. He had established the principles of the Batiniyya Madh'hab, later.)
- ^ Encyclopaedia Iranica, "ʿABDALLĀH B. MAYMŪN AL-QADDĀḤ"