《新唐书·列传·卷一百四十八》
以前的宰相李揆声望很高，卢杞担心皇帝再起用他，就让他出使吐蕃任会盟使，李揆死在路途中。
故宰相李揆有雅望，畏复用，遣为吐蕃会盟使，卒于行。
The former prime minister, Li Kui, was highly respected. Lu Qi was worried that the emperor would reuse him, so he sent him to Tubo as an envoy for the peace conference. Li Kui died on the way.