his twelve successors. This process is known as ijtihad and the clerics are known as marjaʿ, meaning "reference"; the labels Allamah and Ayatollah are in use for Twelver clerics. Islamists Islamist Shīʿīsm () is a new denomination within Twelver Shīʿīsm greatly inspired by the political ideology of the Muslim Brotherhood and mysticism of Ibn Arabi. It sees Islam as a political system and differs from the other mainstream Usuli and Akhbari groups in favoring the idea of the establishment of an Islamic state in Occultation under the rule of the 12th Imam. Hadi Khosroshahi was the first person to identify himself as ikhwani (Islamist) Shīʿa Muslim. Because of the concept of the hidden Imam, Muhammad al-Mahdi, Shīʿa Islam is inherently secular in the age of Occultation, therefore Islamist Shīʿa Muslims had to borrow ideas from Sunnī Islamists and adjust them in accordance with the doctrine of Shīʿīsm. Its foundations were laid during the Persian Constitutional Revolution at the start of 20th century in Qajar Iran (1905–1911), when Fazlullah Nouri supported the Persian king Ahmad Shah Qajar against the will of Muhammad Kazim Khurasani, the Usuli marjaʿ of the time. Ismāʿīlī (Sevener) Ismāʿīlīs, otherwise known as Sevener, derive their name from their acceptance of Ismāʿīl ibn Jaʿfar as the divinely appointed spiritual successor (Imam) to Jaʿfar al-Ṣādiq, the 6th Shīʿīte Imam, wherein they differ from the Twelvers, who recognize Mūsā al-Kāẓim, younger brother of Ismāʿīl, as the true Imam. After the death or Occultation of Muhammad ibn Imam Ismāʿīl in the 8th century CE, the teachings of Ismāʿīlīsm further transformed into the belief system as it is known today, with an explicit concentration on the deeper, esoteric meaning (bāṭin) of the Islamic faith. With the eventual development of Twelver Shīʿīsm into the more literalistic (zahīr) oriented Akhbari and later Usuli schools of thought, Shīʿīsm further developed in two separate directions: the metaphorical Ismāʿīlī group focusing on the mystical path and nature of God and the divine manifestation in the personage of the "Imam of the Time" as the "Face of God", with the more literalistic Twelver group focusing on divine law (sharī'ah) and the deeds and sayings (sunnah) attributed to Muhammad and his successors (the Ahl al-Bayt), who as A'immah were guides and a light (nūr) to God. Though there are several subsects amongst the Ismāʿīlīs, the term in today's vernacular generally refers to the Shīʿa Imami Ismāʿīlī Nizārī community, often