Shaykh al-Islām in the context of "Zenbilli Ali Cemali Efendi"

Following the foundation of the Ottoman state, the title of Sheikh-ul-Islam (Turkish: Şeyhülislâm), formerly used in the Abbasid Caliphate, was given to a leader authorized to issue legal opinion or fatwa. His office was known as the Şeyhülislâm Kapısı, Bâb-ı Fetvâ, or Bâb-ı Meşîhat (The Sheikh's Porte). During the reign of Sultan Murad II, (1421–1444, 1446–1451) the position became an official title, with authority over other muftis in the Empire. In the late 16th century, the Shaykh al-Islam were assigned to appoint and dismiss supreme judges, high ranking college professors, and heads of Sufi orders. Prominent figures include Zenbilli Ali Cemali Efendi (1445–1526), Ibn-i Kemal (Kemalpaşazade) (1468–1533), Ebussuud Efendi (1491–1574) and al-Kawthari (1879–1952).

Kandil (from Arabic: قنديل, romanized: qindīl) refers to five Islamic holy nights, celebrated in Ottoman and Muslim Balkan communities, related to the life of the Islamic prophet Muhammad, when the minarets are illuminated and special prayers are made. It is a tradition dated back to the Ottoman Sultan Selim II of the 16th century, who with the support of the Shaykh al-Islām "Chief Jurisconsult" of the time, thought it was appropriate to light up the minarets on mosques for these blessed occasions.

Kandil is derived from Arabic qindīl "chandelier, candelabra", and refers to an oil lamp. Kandil nights play a less significant role than the Bayram festivals.

Şemseddin Ahmed (1469–1534), better known by his pen name Ibn Kemal (also Ibn Kemal Pasha) or Kemalpaşazâde ("son of Kemal Pasha"), was an Ottoman historian, Shaykh al-Islām, jurist and poet.

He was born into a distinguished military family in Edirne and as a young man he served in the army and later studied at various madrasas and became the Kadı of Edirne in 1515. He had Iranian roots on his mother's side. He became a highly respected scholar and was commissioned by the Ottoman ruler Bayezid II to write an Ottoman history (Tevārīh-i Āl-i Osmān, "The Chronicles of the House of Osman"). During the reign of Selim the Resolute, in 1516, he was appointed as military judge of Anatolia and accompanied the Ottoman army to Egypt. During the reign of Suleiman the Magnificent he was appointed as the Shaykh al-Islām, i.e. supreme head of the ulama, a post which he held until his death.

Ebussuud Efendi (Turkish: Mehmed Ebüssuûd Efendi, 30 December 1490 – 23 August 1574), was a Hanafi Maturidi Ottoman jurist and Quran exegete, served as the Qadi (judge) of Istanbul from 1533 to 1537, and the Shaykh al-Islām of the Ottoman Empire from 1545 to 1574. He was also called "El-İmâdî" because his family hailed from Imâd, a village near İskilip.

Ebussuud was the son of Iskilipli Sheikh Muhiddin Muhammad Efendi. In the 1530s, Ebussuud served as a judge in Bursa, Istanbul and Rumelia, where he brought local laws into conformity with Islamic divine law (sharia). Sultan Suleiman the Magnificent promoted him to Shaykh al-Islām – the supreme judge and highest official – in 1545, an office Ebussuud held until his death and which he brought to the peak of its power. He worked closely with the Sultan, issuing judicial opinions that legitimised Suleiman's killings of Yazidis and his successor Selim's attack on Cyprus. Ebussuud also issued legal rulings (fatwās) which labeled the Qizilbash, regardless of whether they lived on Iranian or Ottoman soil, as "heretics", and declared that killing them would be viewed as praiseworthy, rather than just being allowed according to the law.