烏古斯人
After many battles, the western Oghuz Turks established their own state and later constructed the Ottoman Empire. The main migration of the Oghuz Turks occurred in medieval times, when they spread across most of Asia and into Europe and the Middle East. They also took part in the military encounters of the Crusades. In 1090–91, the Turkic Pechenegs reached the walls of Constantinople, where Emperor Alexius I with the aid of the Kipchaks annihilated their army.