It used a trebuchet to beat the Southern (*) Song at Xiangyang [SHAWN-yang].
Andre de Longjumeau carried a failed offer of French alliance with this empire. This empire employed the Pony Express-like yam communication system. Like the Turks, people in this empire followed Tengrism. This empire lobbed dead bodies into the Genoan city of Caffa, starting the Black Death in Europe. It used a trebuchet to beat the Southern (*) Song at Xiangyang [SHAWN-yang]. This empire's army was reinforced by light cavalry called mangudai who could allegedly ride for days, drinking only horse milk. The empire's namesake "peace" ended with the fall of the Golden Horde and Yuan Dynasties. For 10 points, name this land empire founded by Genghis Khan.
Andre de Longjumeau carried a failed offer of French alliance with this empire.
Mongol Empire [or the Mongols; or Mongolia; or Golden Horde or Yuan until they are read, respectively]