Tomb of Sultan Osman Bey, founder of the Ottoman Empire at Bursa - Turkey. Fourth largest city and the first Ottoman Capital. Historically also known Prussa and later Brussa. On the northwestern slopes of Mount Uludag in the south of the Marmara region. Known as Yesil Bursa (Green Bursa), because of many parks and gardens as well as vast forests. The area is rich in archaeology.