丘处机
In the 12th century, the Quanzhen School was founded in Shandong. It flourished during the 13th and 14th centuries 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.