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Karagahisar Fortress, this place is known as the first castle conquered by the Ottomans. The castle came under Seljuk rule in the 11th and 12th centuries, because Osman Ghazi gave a sermon in his name and issued coins; Historians have accepted the importance of Karagahisar at the founding stage of the Ottoman Empire. It is estimated that the castle was the first fortress to be conquered by the Ottomans.
