Languages of the Ottoman Empire
The Ottomans had three influential languages: Turkish, spoken by the majority of the people in Anatolia and by the majority of Muslims of the Balkans except in Albania, Bosnia, and various Aegean Sea islands; Persian, initially used by the educated in northern portions of the Ottoman Empire before being displaced by Ottoman Turkish; and Arabic, used in southern portions of the Ottoman Empire; Arabic was spoken mainly in Arabia, North Africa, Mesopotamia and the Levant. Throughout the vast Ottoman bureaucracy Ottoman Turkish language was the official language, a version of Turkish, albeit with a vast mixture of both Arabic and Persian grammar and vocabulary.
Mosul
Despite being a part of the Ottoman Empire, during the four centuries of Ottoman rule Mosul was considered "the most independent district" within the Middle East, following the Roman model of indirect rule through local notables. "Mosuli culture developed less along Ottoman–Turkish lines than along Iraqi–Arab lines; and Turkish, the official language of the State, was certainly not the dominant language in the province."