Mustafa Bin Abdallah (Kâtib Çelebi, Hacı Halife): A Pioneer of Ottoman Art and Scholarship Mustafa bin Abdullah, known as Kâtib Çelebi and Hajji Khalifa, stands as a monumental figure in the annals of 17th-century Ottoman history – not merely for his role as a diplomat and administrator but crucially, for his unparalleled contribution to Ottoman art and scholarship. Born in Constantinople around 1609, he died there in 1657, leaving be…