《资治通鉴·唐纪·唐纪八》
幽州长史李玄道是房玄龄的外甥，托王君廓捎信给房玄龄。君廓私下拆信，不认识草书字体，怀疑他告发自己的罪过，走到渭南，杀死驿站吏卒逃跑，将要奔往突厥，途中被野人杀死。
长史李玄道，房玄龄从甥也，凭君廓附书，君廓私发之，不识草书，疑其告己罪，行至渭南，杀驿吏而逃；将奔突厥，为野人所杀。
Youzhou Changshi Li Xuandao was the nephew of Fang Xuanling and asked Wang Junkou to pass a letter to Fang Xuanling. Junkou opened the letter in private, but did not recognize the cursive characters, so he suspected that Li Xuandao was exposing his crimes. He escaped after killing the clerk in Weinan and was on his way to the Turks when he was killed by a savage.