It was the kingdom of the Khwarazm-Shahs. Their king Alaudin Mohammed considered himself quite the military mastermind, and in his arrogance decided to teach the Mongols a lesson. He started by intercepting 450 merchants traveling through his kingdom under Mongol protection. Accusing these poor merchants of spying for the Mongols, he had them killed and took their goods, but he quite deliberately let one man escape so that he would take news of the massacre back to Chengez. He was looking for trouble. The Mongol lord sent three envoys west to demand reparations. It was probably the last time
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