Title: Abdallah al-Mahdi Billah
Content:  In a letter sent to the Ismāʿīlī community in Yemen by Abd Allah al-Mahdi Billah, which was reproduced by Ja'far bin Mansūr al-Yemen, ʿAbd Allāh al-Aftah ibn Jaʿfar al-Sadiq was referred to as Sāhib al-Haqq or the legitimate successor of Imām Jaʿfar al-Sadiq. According to ʿAbd Allāh al-Mahdi bi'l-Lāh, ʿAbd Allāh ibn Ja'far had called himself Ismāʿīl ibn Jaʿfar for the sake of taqiyya, and each of his successors had assumed the name Muhammad. ʿAbd Allāh al-Mahdi Billah explains the genealogy of the Fatimid caliphs and he claims Fatimid ancestry by declaring himself to be ʿAli ibn al-Ḥusayn ibn Aḥmad ibn ʿAbadullāh ibn ʿAbd Allāh ibn Jaʿfar al-Sadiq. But the Imamah (Ismaili doctrine) had later been formulated in a different manner since ʿAbd Allāh's explanation of his ancestry was not accepted by his successors. {| class="" style="float:; margin: 2ex 0 0.6em 0.5em; width: 8em; line-height:111%;" ! The genealogy of the Fatimid caliphs according to ʿUbayd Allāh al-Mahdi bi'l-Lāh
Title: Abdallah ibn Mu'awiya
Content:  Abdallah ibn Mu'awiya was a great-grandson of Ali's brother, Ja'far ibn Abi Talib. Following the death of Ali's grandson Abu Hashim in 703, the leadership of the Alid cause was vacant, and several candidates vied for it: one party claimed that Abu Hashim had transferred his rights to the Abbasid Muhammad ibn Ali, while another faction wanted to proclaim Abdallah ibn Amr al-Kindi as the next imam. The latter, however, proved unsatisfactory, and Abdallah ibn Mu'awiya was chosen instead. Abdallah claimed not only the imamate, but maintained that, according to K.V. Zetterstéen, divinity. Consequently, his followers embraced the concept of reincarnation and rejected the resurrection of the dead.
Title: Abdallah al-Mahdi Billah
Content:  wet-nurse, and Ja'far became a close confidant of Sa'id until his death. Sa'id's only child, Abd al-Rahman, the future al-Qa'im bi-Amr Allah, was born in March or April 893. While ostensibly merely the stewards for the absent imam, Ja'far reports that Abu'l-Shalaghlagh—perhaps encouraged by the rapid progress of the daʿwa, now establishing armed strongholds—secretly declared himself to senior members of the daʿwa not as the ḥujja for Muhammad ibn Isma'il, but the actual imam; and that he claimed for his nephew the title of mahdī, and the latter's infant son the title of qāʾīm. Various genealogies were later put forth by the Fatimids to justify this claim (see below). In the most common, Abdallah the Elder was proclaimed to be the son of Muhammad ibn Isma'il, but 
Title: Abdallah ibn Ali
Content:  news of al-Saffah's death, he proclaimed himself as Caliph, claiming that al-Saffah had promised him the succession as a reward for his role in the overthrow of Marwan II. The veracity of Abdallah's claim and the level of legitimacy he enjoyed vis-à-vis al-Mansur is difficult to assess following the prevalence of hostile traditions after his defeat, but, as P. Cobb comments, "what all accounts agree on is that the succession to al-Saffah was not solidly secured before his death", and there are indications that Abdallah "had portrayed himself as an obvious successor [...] in the few years prior to al-Saffah's death." Nevertheless, he enjoyed broad support 
Title: Abdullah al-Aftah
Content:  In a letter sent to the Ismāʿīlī community in Yemen by Abdullah al-Mahdi Billah, which was reproduced by Ja'far ibn Mansur al-Yaman, ʿAbd Allāh al-Aftah ibn Jaʿfar al-Sadiq was referred as Sāhib al-Haqq or the legitimate successor of Imām Jaʿfar al-Sadiq by AbdAllāh in an attempt to explain the genealogy of his ancestors. Instead of tracing his descent to Isma'il ibn Jafar and his son Muhammad ibn Ismail, the first Fatimid Caliph Abdullah al-Mahdi Billah designates Jaʿfar's eldest son ʿAbd Allāh as his forefather. According to ʿAbdallah al-Mahdi Billah, ʿAbd Allāh ibn Ja'far had called himself Ismāʿīl ibn Jaʿfar for the sake of taqiyya, and each of his successors had assumed the name Muhammad. ʿAbdallah al-Mahdi Billah explains the genealogy of the Fatimid Caliphs and he claims Fatimid ancestry by declaring himself to be ʿAli ibn al-Ḥusayn ibn Aḥmad ibn ʿAbadullāh ibn ʿAbd Allāh ibn Jaʿfar al-Sadiq. But the Imamah (Ismaili doctrine) was later formulated in a different manner since ʿAbdallah al-Mahdi Billah's explanation of his ancestry was not accepted by his successors.
Title: Abd al-Rahman al-Mahdi
Content:  Muhammad Ahmad died of typhus a few months after his victory, leaving power to his three deputies, or Kalifas. Abd al-Rahman was born on 15 July 1885 in Omdurman, three weeks after his father's death. His mother was granddaughter of a former Sultan of Darfur, Mohammed al-Fadl. As a child, Abd al-Rahman's only formal education was that of a religious school where the pupils memorized the Quran. By the age of eleven he had recited the Quran. After a prolonged struggle, by 1891 the Kalifa Abdallahi ibn Muhammad emerged as sole leader due to his support from the warlike nomadic Baggara Arabs 
Title: Fatimid Caliphate
Content:  In 899, Abdallah al-Akbar's great-grandson, Abdallah, became the new head of the movement, and introduced a radical change in the doctrine: no longer was he and his forebears merely the stewards for Muhammad ibn Isma'il, but they were declared to be the rightful imams, and Abdallah himself was the awaited mahdī. Various genealogies were later put forth by the Fatimids to justify this claim by proving their descent from Isma'il ibn Ja'far, but even in pro-Isma'ili sources, the succession and names of imams differ, while Sunni and Twelver sources of course reject any Fatimid descent from the Alids altogether and consider them impostors. Abdallah's 
Title: Abdallah al-Mahdi Billah
Content:  who did not openly lay claim to the caliphate, but were considered by their followers as the true representatives of God on earth. The sixth imam, Ja'far al-Sadiq, had appointed (naṣṣ) his son Isma'il ibn Ja'far as his successor, but Isma'il died before his father, and when al-Sadiq himself died in 765, the succession was left open. One faction of Shi'a held that al-Sadiq had designated another son, Musa al-Kadhim, as his heir. Others followed other sons, Muhammad al-Dibaj and Abdullah al-Aftah—shortly after his death, they went over to Musa's camp—or even refused to believe that al-Sadiq had died, and expected his return as a messiah. Musa's adherents, who constituted the majority of al-Sadiq's followers, followed his line down to the 
Title: Abdallahi ibn Muhammad
Content:  Abdullah was born into the Ta'aisha Baqqara tribe in around 1846 and was trained and educated as a preacher and holy man. His father, Mahommed et Taki, had determined to emigrate to Mecca with his family, but the unsettled state of the region prevented him, and he died in Africa after advising Abdullah, to take refuge on the Nile, and to proceed to Mecca at a favourable opportunity. On his journey, Abdullah met and became a follower of Muhammad Ahmad "the Mahdi" around 1880 and was named Khalifa by the Mahdi in 1881, becoming one of his chief lieutenants. He married Hafsa Abdelsalam; she eventually bore him a son. The other Khalifas were Ali wad Hilu and Muhammad Sharif. Abdullah was given command of a large part of the Mahdist army, and during the next four years led them in a series of victories over the Anglo-Egyptians. He fought at the Battle of El Obeid, where William Hicks's Anglo-Egyptian army was destroyed (November 5, 1883), and was one of the principal commanders at the siege of Khartoum, (February 1884 – January 26, 1885).
Title: Abd al-Rahman III
Content:  some festive occasions. Most importantly Abdallah gave Abd al-Rahman his ring, the symbol of power, when Abdallah fell ill prior to his death. Abd al-Rahman succeeded Abdallah the day after his death, 16 October 912. Historiographers of the time, such as Al-Bayan al-Mughrib and the Crónica anónima de Abd al-Rahman III, state that his succession was "without incident". At the time, Abd al-Rahman was about 21 or 22 years old. He inherited an emirate on the verge of dissolution, his power extending not far beyond the vicinity of Córdoba. To the north, the Christian Kingdom of Asturias was continuing its program of 

Question: Verify the following claims with "True" or "False": The successor of Abdul Taib Mahmud was called Abdul Rahman Ya'kub.
Answer: True