| Lists of religious leaders by century: |
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This is a list of the top-level leaders for religious groups with at least 50,000 adherents, and that led anytime from January 1, 1401, to December 31, 1500. It should likewise only name leaders listed on other articles and lists.
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The title His Holiness is an official title or style referring to leaders in a number of religious traditions. It is used to refer to the pope in Catholicism; this use can be traced back several hundred years. It is also an official title for Oriental Orthodox patriarchs or Catholicoi. It is used to refer to religious leaders in Islam, Buddhism, and Bon. Buddhist leaders referred to this way include Lu Sheng-yen, the Dalai Lama, the Menri Trizin, and Da'i al-Mutlaq of the Dawoodi Bohras, among others.
The Musta‘lī are a branch of Isma'ilism named for their acceptance of al-Musta'li as the legitimate nineteenth Fatimid caliph and legitimate successor to his father, al-Mustansir Billah. In contrast, the Nizari—the other living branch of Ismailism, presently led by Aga Khan IV—believe the nineteenth caliph was al-Musta'li's elder brother, Nizar. Isma'ilism is a branch of Shia Islam.
Idris Imad al-Din was the 19th Tayyibi Isma'ili Dāʿī al-Muṭlaq and a major religious and political leader in 15th-century Yemen, as well as a notable theologian and the most important medieval Isma'ili historian. His work is fundamental for the history of the Fatimid Caliphate and the Isma'ili communities in Yemen.
