《新唐书·列传·卷一百四十一》
如意元年，吐蕃大首领曷苏率贵川部落与党项族三十万人请降，武后派右玉钤卫将军张玄遇为安抚使率兵两万去迎。驻扎在大度水。吐蕃擒曷苏而去。
又明年，大首领曷苏率贵川部与党项种三十万降，后以右玉钤卫将军张玄遇为安抚使，率兵二万迎之，次大度水，吐蕃禽曷苏去。
In the first year of Ruyi, He Su, the Grand Chief of Tubo, led 300,000 tribes of the Gui River and the Dangxiang tribe to ask for surrender. Empress Wu sent Zhang Xuan, the general of the Right Jade Bell Guard, as the appeasement envoy and led 20,000 troops to meet them. Stationed by the Dadu water. Tubo captured He Su and left.