The Mongol conquest under Genghis Khan during the 13th century would bring about a change to the region. The Mongol invasion of Central Asia led to the displacement of some of the Iranian-speaking people of the region, their culture and heritage being superseded by that of the Mongolian-Turkic peoples who came thereafter. The invasions of Bukhara, Samarkand, Urgench and others resulted in mass murders and unprecedented destruction, such as portions of Khwarezmia being completely razed.