As they conquered more and more people, they learned from them. And by the time of Genghis Khan's death in 1227, they had conquered much of northern Asia. And the Mongols will continue on. Within half a century of Genghis Khan's death, they will have conquered not just northern Asia. When they capture Baghdad, many historians consider this the end of the Islamic Golden Age. As much pressure as the Western Europeans were putting on the Turks during their crusades, it was actually the Mongol threat that was much more significant. Before fragmenting, it is the largest contiguous empire in world history.