Relive the exploits of four sons of Tolui, the youngest heir of Chinggis Khan. Among other adventures, Mongke Khan led the attack on China’s Song dynasty in concert with his brother Qubilai, eventually to become the legendary Qubilai Khan. Meanwhile, Hulagu Khan engineered the brilliant siege of Baghdad, while the youngest brother, Ariq Boke, attempted to usurp the khanate, sparking a civil war.