Shaykh al-Islām

[2]: 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.

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.

[3] Like other honorific titles starting with the word sheikh, the term shaykh al-islam was in the classical era reserved for ulama and mystics.

[citation needed] Under the Ilkhans, the Delhi Sultanate and the Timurids the title was conferred, often by the ruler, to high-ranking ulama who performed various functions but were not generally muftis.

[2]: 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).

And his title with Shaykhul Islam, we still often hear from holy orals until now, and will continue to survive tomorrow..",[10][11] which was recorded by his student al Sakhawi.