This enormous Seljuk-style shrine (1399) is Bursa's most dominant and durable mosque. Sultan Beyazıt I built it in a monumental compromise – having pledged to build 20 mosques after defeating the Crusaders in the Battle of Nicopolis, he settled for one mosque, with 20 small domes. Two massive minarets augment the domes, while the giant square pillars and portals within are similarly impressive. The mimber (pulpit) boasts fine wood carvings, and the walls feature intricate calligraphy.
Bursa's Karagöz shadow-puppet theatre reportedly began with Ulu Camii's construction.