When Muhammad II of Khwarezm executed a contingent of merchants dispatched by the Mongols, Genghis Khan declared war on the Khwārazm-Shāh dynasty in 1219.
In accordance with a complaint by the governor Arghun the Elder (Arghun agha), Möngke Khan prohibited ortog-merchants and nobles from abusing relay stations and civilians in 1251 [REF].