Islam in the Ottoman Empire
Islam was the official religion of the Ottoman Empire. The highest position in Islam, "caliphate", was claimed by the sultan, after the defeat of the Mamluks which was established as Ottoman Caliphate. The Sultan was to be a devout Muslim and was given the literal authority of the Caliph. Additionally, Sunni clerics had tremendous influence over government and their authority was central to the regulation of the economy. Despite all this, the Sultan also had a right to decree, enforcing a code called Kanun (law) in Turkish. Additionally, there was a supreme clerical position called the Sheykhulislam ("Sheykh of Islam" in Arabic). Minorities, particularly Christians and Jews but also some others, were mandated to pay the jizya, the poll tax as mandated by traditional Islam.
History of the Ottoman Empire
The Ottoman Empire had long been the "sick man of Europe" and after a series of Balkan wars by 1914 had been driven out of nearly all of Europe and North Africa. It still controlled 28 million people, of whom 17 million were in modern-day Turkey, 3 million in Syria, Lebanon and Palestine, and 2.5 million in Iraq. Another 5.5 million people were under nominal Ottoman rule in the Arabian peninsula.