Ulu Cami Mosque was constructed by the 4. Emperor of Ottoman Empire, Yıldırım Bayezid between 1396 - 1399. Ulu Cami Mosque shows early Ottoman Empire era architecture. It is the biggest sample of its type with its 20 domes. If you see the Ulu Cami Mosque during a day tour in Bursa you can feel the soul of the capital city of young Ottoman Empire.