Shaykh al-Islām (Arabic: شيخ الإسلام, romanized: Šayḫ al-Islām; Persian: شِیخُالاسلام Sheykh-ol-Eslām; Ottoman Turkish: شیخ الاسلام, romanized: Şhaykḫu-l-İslām or Sheiklı ul-Islam; Turkish: Şeyhülislam) was used in the classical era as an honorific title for outstanding scholars of the Islamic sciences.: 399  It first emerged in Khurasan towards the end of the 4th Islamic century.: 399 In the central and western lands of Islam, it was an informal title given to jurists whose fatwas were particularly influential, while in the east it came to be conferred by rulers to ulama who played various official roles but were not generally muftis. Sometimes, as in the case of Ibn Taymiyyah, the use of the title was subject to controversy. In the Ottoman Empire, starting from the early modern era, the title came to designate the chief mufti, who oversaw a hierarchy of state-appointed ulama. The Ottoman Sheikh al-Islam (French spelling: cheikh-ul-islam[note 1]) performed a number of functions, including advising the sultan on religious matters, legitimizing government policies, and appointing judges.: 400 
With the abolition of the Caliphate in 1924, the official Ottoman office of Shaykh al-Islām, already in decline, was eliminated. Modern times have seen the role of chief mufti carried out by grand muftis appointed or elected in a variety of ways.
Like other honorific titles starting with the word sheikh, the term shaykh al-islam was in the classical era reserved for ulama and mystics. It first appeared in Khurasan in the 4th century AH (10th century AD).: 399 In major cities of Khurasan it seems to have had more specific connotations, since only one person held the title at any given time and place. Holders of the title in Khurasan were among the most influential ulama, but there is no evidence that they delivered fatwas.
In the Kashmiri Sultanate, it was implemented during the reign of Sultan Sikandar. He established the office of the Shaikhu'l-Islam under the influence of Sayyid Muhammad Hamadan, who had come to Kashmir in 1393 AD.
In Syria and Egypt, it was given to influential jurists and had an honorific rather than an official role. By 700 AH/1300 AD in the central and western lands of Islam, the term became associated with giving of fatwas.
Ibn Taymiyya was given the title by his supporters but his adversaries contested this use.: 400 For example, the Hanafi scholar 'Ala' al-Din al-Bukhari issued a fatwa stating that anyone who called Ibn Taymiyya "Shaykh al-islam" had committed disbelief (kufr). However, Shafiite scholar Ibn Hajar al-Asqalani defended the title of Shaykh al Islam for Ibn Taymiyyah, saying in his own words, "...His status as imam, sheikh, Taqiyuddin Ibn Taimiyah, is brighter than the sun. And his title with Shaykhul Islam, we still often hear from holy orals until now, and will continue to survive tomorrow..", which was recorded by his student al Sakhawi. The Hanbalite madhhab scholar and follower of Ibn Taymiyyah, Ibn Qayyim al-Jawziyya (himself also given Shaykh al Islam title by his contemporary) defended the usage of the title for him. The two of them are known for contradicting the view of the majority of scholars of all four schools of thought (Hanafi, Shafi'i, Maliki, and Hanbali) of their time in Damascus and of later periods.
In the Ottoman EmpireEdit
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In the Ottoman Empire, which controlled much of the Sunni Islamic world from the 14th to the 20th centuries, the Grand Mufti was given the title Sheikh ul-islam (Ottoman Turkish: Şeyḫülislām). The Ottomans had a strict hierarchy of ulama, with the Sheikh ul-Islam holding the highest rank. A Sheikh ul-Islam was chosen by a royal warrant amongst the qadis of important cities. The Sheikh ul-Islam had the power to confirm new sultans. However, once the sultan was affirmed, the sultan retained a higher authority than the Sheik ul-Islam. The Sheikh ul-Islam issued fatwas, which were written interpretations of the Quran that had authority over the community. The Sheikh ul-Islam represented the Sacred Law of Shariah and in the 16th century its importance rose which led to increased power. Sultan Murad IV appointed a Sufi, Zakeriyazade Yahya Efendi, as his Sheikh ul-Islam during this time which led to violent disapproval. The objection to this appointment made obvious the amount of power the Sheikh ul-Islam had, since people were worried he would alter the traditions and norms they were living under by issuing new fatwas.
The office of Sheikh ul-islam was abolished in 1924, at the same time as the Ottoman Caliphate. After the National Assembly of Turkey was established in 1920, the office of Sheikh ul-Islam was placed in the Shar’iyya wa Awqaf Ministry. In 1924, the office of Sheikh ul-Islam was abolished at the same time as the Ottoman Caliphate. The office was replaced by the Presidency of Religious Affairs. As the successor entity to the office of the Sheikh ul-Islam, the Presidency of Religious Affairs is the most authoritative entity in Turkey in relation to Sunni Islam.
The following Islamic scholars have been given the honorific title "Shaykh al-Islam":
- Abu Bakr al-Siddiq (b. c. 573 AD)
- Umar Ibn al-Khattab (b. 583 or 584 AD)
- Abu Mansur al-Maturidi (b. 231 AH)
- Al-Daraqutni (b. 306 AH)
- Al-Bayhaqi (b. 384 AH)
- Abu Ishaq al-Shirazi (b. 393 AH)
- Abu Talib al-Makki (b. 386 AH)
- Khwaja Abdullah Ansari: 400 (b. 481 AH)
- Al-Juwayni (b. 419 AH)
- Fakhr al-Din al-Razi (b. 544 AH)
- Ibn al-Jawzi (b. 509 or 510 AH)
- Al-'Izz ibn 'Abd al-Salam (b. 577 AH)
- Ibn Daqiq al-'Id (b. 625 AH)
- Al-Nawawi (b. 631 AH)
- Ibn Taymiyyah (b. 661 AH)
- Taqi al-Din al-Subki(b. 683 AH)
- Taj al-Din al-Subki (b. 727 AH)
- Ibn Hajar al-Asqalani (b. 773 AH)
- Zakariyya al-Ansari (b. 823 AH)
- Ibn Hajar al-Haytami (b. 909 AH)
- Siraj al-Din al-Bulqini (b. 724 AH)
- Ahmad Zayni Dahlan (b. 1231 or 1232 AH)
- Hussain Ahmed Madani (b. 1296 AH)
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