The Ottoman Empire (; Ottoman Turkish: دولت عليه عثمانيه Devlet-i ʿAlīye-i ʿOsmānīye, lit. 'The Sublime Ottoman State'; Turkish: Osmanlı İmparatorluğu or Osmanlı Devleti; French: Empire ottoman) was a state that controlled much of Southeastern Europe, Western Asia, and Northern Africa between the 14th and early 20th centuries. It was founded at the end of the 13th century in northwestern Anatolia in the town of Söğüt (modern-day Bilecik Province) by the Turkoman tribal leader Osman I. After 1354, the Ottomans crossed into Europe and with the conquest of the Balkans, the Ottoman beylik was transformed into a transcontinental empire. The Ottomans ended the Byzantine Empire with the 1453 conquest of Constantinople by Mehmed the Conqueror.Under the reign of Suleiman the Magnificent, the Ottoman Empire marked the peak of its power and prosperity as well as the highest development of its government, social, and economic systems.
During the government of the Prophet Muhammad (SAWA) and Ameerul Mo'mineen (AS), they did not convert any church into Mosque. It is left to the people of the area whether they want to remain Christians, so, church will remain as a church for them, but if they opt to be Muslims willingly and want to use the place as a Mosque, they are free to do that.
Islam does not confiscate the religious places of other communities.