Improve the grammaticality: Mutukan (Mö'etüken), son of Chagatai Khan and favourite grandson of Genghis Khan, was killed in battle by an arrow from the besieged walls, which led Genghis to massacre the population of the city and its surrounding region (the origin of the city's moniker "City of Woe").
Mutukan (Mö'etüken), son of Chagatai Khan and favourite grandson of Ghenghis Khan, was killed in battle by an arrow from the besieged walls, which led Genghis to massacre the population of the city and its surrounding region (the origin of the city's moniker "City of Woe").