 Gelenbevi Ismail Efendi

Ismail (bin Mustafa bin Mahmûd) Gelenbevi (born 1730, death 1790 or 1791) was an Ottoman Turkish mathematician and Professor of Geometry at the Naval College in Istanbul, Turkey.His life and work are well documented in several scholarly works in English and Turkish
such as the thesis by Alaettin Avci "Turkiyede Askeri Okullar Tarihcesi" (History of the Military Schools in Turkey), 1963, published by the Research and Development Office of the Turkish General Staff, 
and M.K.