Katip Çelebi

Kâtip Çelebi (Kātib Çelebi "Gentleman Scribe"), the pen name of Mustafa bin Abdullah (1609–1657), also later known as Haji Khalifa (Hacı Halife) or Kalfa, was an Ottoman scholar. A historian and geographer, he is regarded as one of the most productive authors of non-religious, scientific literature in the 17th-century Ottoman Empire.