Flag of Ottoman Empire. 
"The painter Hieronymus (aka Jérôme) Bosch lived in the Middle Ages (c. 1450-1516) in Brabant. He painted very strange, surrealistic-like paintings. Some of these paintings show Turkish flags. I guess these representations reflect how the West in Bosch's time perceived 'the Turks'. The flags are generally red with a golden crescent." Jean Valentin, 27 May 2003 (crwflags.com)
Ottoman Empire
Tarataraq