Sorry, this picture is a bit unsharp. What you see is Mehmet the Conqueror. From the Wikipedia: "Mehmed II (March 30, 1432 – May 3, 1481) (Ottoman Turkish: محمد ثانى Meḥmed-i s̠ānī, Turkish: II. Mehmet), (also known as el-Fātiḥ (الفاتح), "the Conqueror" in Ottoman Turkish, or, in modern Turkish, Fatih Sultan Mehmet; also called Mahomet II in early modern Europe) was Sultan of the Ottoman Empire (Rûm until the conquest) for a short time from 1444 to September 1446, and later from February 1451 to 1481. At the age of 21, he conquered Constantinople and brought an end to the Byzantine Empire, absorbing its administrative apparatus into the Ottoman state. Mehmet continued his conquests in Asia, with the Anatolian reunification, and in Europe, as far as Belgrade. Mehmed II is regarded as a national hero in Turkey, and his name is given to Istanbul's Fatih Sultan Mehmet Bridge."

Compare my pictures from the Istanbul Askerlik museum, starting with this one.