 In the 12th century , the Quanzhen School was founded in Shandong . It flourished during the 13th and 14th century and during the Yuan dynasty became the largest and most important Taoist school in Northern China . The school 's most revered master , Qiu Chuji , met with Genghis Khan in 1222 and was successful in influencing the Khan towards exerting more restraint during his brutal conquests . By the Khan 's decree , the school also was exempt from taxation . 
