During this era, the region was dominated by the Sakya lama with the Mongols support, so it is also called the Sakya dynasty. The first documented contact between the Tibetans and the Mongols occurred when the missionary Tsang-pa Dung-khur (gTsang-pa Dung-khur-ba) and six disciples met Genghis Khan, probably on the Tangut border where he may have been taken captive, around 1221–2.[29] He left Mongolia as the Quanzhen sect of Daoism gained the upper hand, but remet Genghis Khan when Mongols conquered Tangut shortly before the Khan's death.