of caliph, then the majlis should select from the list of candidates. Some modern political interpretations regarding the role of the Majlis ash-Shura include those expressed by the Egyptian Islamist author and ideologue Sayyid Qutb, prominent member of the Muslim Brotherhood, and the Palestinian Muslim scholar and propagandist Taqiuddin al-Nabhani, founder of the pan-Islamist political party Hizb ut-Tahrir. In an analysis of the shura chapter of the Quran, Qutb argued that Islam requires only that the ruler consult with at least some of the ruled (usually the elite), within the general context of divine laws that the ruler must execute. Al-Nabhani argued that the shura is important and part of "the ruling structure" of the Islamic caliphate, "but not one of its pillars", and may be neglected without the caliphate's rule becoming un-Islamic. However, these interpretations formulated by Qutb and al-Nabhani are not universally accepted in the Islamic political thought, and Islamic democrats consider the shura to be an integral part and important pillar of Islamic political system. Separation of powers In the early Islamic caliphates, the caliph was the head of state, and had a position based on the notion of a successor to Muhammad's political authority, who, according to Sunnī Muslims, were ideally elected by the people or their representatives, as was the case for the election of Abū Bakr (632–634), ʿUthmān ibn ʿAffān (644–656), and ʿAlī ibn Abī Ṭālib (656–661). After the rāshidūn caliphs, later caliphates during the Islamic Golden Age had a much lesser degree of democratic participation, but since "no one was superior to anyone else except on the basis of piety and virtue" in Islam, and following the example of Muhammad, later Islamic rulers often held public consultations with the people in their affairs. The legislative power of the caliph (or later, the sultan) was always restricted by the scholarly class, the ulama, a group regarded as the guardians of Islamic law. Since the sharia law was established and regulated by the schools of Islamic jurisprudence, this prevented the caliph from dictating legal results. Sharia-compliant rulings were established as authoritative based on the ijma (consensus) of legal Muslim scholars, who theoretically acted as representatives of the entire Ummah (Muslim community). After law colleges (madrasa) became widespread beginning with the 11th and 12th century CE, students of Islamic jurisprudence often had to obtain an ijaza-t al-tadris wa-l-ifta ("license to teach and issue legal opinions") in