Genghis Khan, meaning Great King, was the title of the rulers of the Mongol Empire in the 13th Century AD. It is commonly only used to describe the first Genghis Khan, Temujin, but it should be used to describe his successors as well. As the power of the Mongol Empire waned and areas such as the Il-Khanate of Persia broke away from central Mongol control, the leaders eventually took the ordinary title of Khan.