List of lingua francas
Turkish is still in use and widely spoken in several areas formerly part of the Ottoman Empire and may be understood by older people in other parts of the Middle East.
Secularism in Turkey
The establishing structure (Ruling institution of the Ottoman Empire) of the Ottoman Empire (13th century) was an Islamic state in which the head of the Ottoman state was the Sultan. The social system was organized around millet. Millet structure allowed a great degree of religious, cultural and ethnic continuity to non-Muslim populations across the subdivisions of the Ottoman Empire and at the same time it permitted their incorporation into the Ottoman administrative, economic and political system. The Ottoman-appointed governor collected taxes and provided security, while the local religious or cultural matters were left to the regional communities to decide. On the other hand, the sultans were Muslims and the laws that bound them were based on the Sharia, the body of Islamic law, as well as various cultural customs. The Sultan, beginning in 1517, was also a Caliph, the leader of all the Sunni Muslims in the world. By the turn of the 19th century the Ottoman ruling elite recognized the need to restructure the legislative, military and judiciary systems to cope with their new political rivals in Europe. When the millet system started to lose its efficiency due to the rise of nationalism within its borders, the Ottoman Empire explored new ways of governing its territory composed of diverse populations.