Mustaali

Mustā‘lī Ismāʿīlī or Mustā‘lī (Arabic: مستعلي‎) is a sect of Ismā'īlī Shia Islam, so named for their acceptance of Al-Musta'li as the nineteenth Fatimid caliph and legitimate successor to his father, al-Mustansir. In contrast, the Nizāriyya Muslims—presently headed by the Aga Khan—believe the rightful nineteenth caliph was Musta'lī's elder brother, Nizār. The Mustaʿlī sect originated in Egypt, later moved its religious center to Yemen, and gained a foothold in India through missionaries of the 11th century.

Fiqhs of Mustā‘līyyah: Ṭayyibiyyah and Ḥāfiziyyah

The "Mustā‘līyyah" has a fiqh system, which is known as the Taiyabi or Ṭayyibī (Arabic: طيبي‎), after the last Imām whom they recognize, Ṭayyib Abī l-Qāṣim. Historically, there was a distinction between the Ṭayyibiyyah and the Ḥāfiziyyah, the latter recognizing the Fatimid rulers of Egypt (between 1130–1171) as legitimate Imāms, and not Ṭayyib Abī l-Qāṣim. The Hafizi view lost all support following the downfall of the Fatimid dynasty: current-day Mustā‘līyyah are all Ṭayyibiyyah.