Ḳoca Mi‘mār Sinān Āġā (Ottoman Turkish: خوجه معمار سنان آغا) (April 15, 1489 - April 09, 1588) was the chief Ottoman architect an civil engineer for sultans Suleiman I, Selim II and Murad III. He was, during a period of fifty years, responsible for the construction or the supervision of every major building in the Ottoman Empire. More than three hundred structures are credited to his name, exclusive of his more modest projects, such as his Koran schools (sibyan mektebs).