《新唐书·列传·卷一百四十一》
此时吐蕃又派使者请和，要求罢去四镇的守兵，索分十姓之地，武后诏派通泉尉郭元振出使，半路上遇见钦陵。
遣使者请和，约罢四镇兵，求分十姓地。武后诏通泉尉郭元振往使，道与钦陵遇。
At this time, Tubo sent an envoy to ask for peace, asking to dismiss the garrisons of the four towns and divide the territory of the Ten surnames. Empress Wu ordered Guo Yuanzhen, Captain of Tongquan, to serve as an envoy, and he met Qinling halfway.