《新唐书·列传·卷一百一十九》
那时迁都洛阳，柳璨迎合贼人的旨意，陷害有才能有声望的人，帮助削弱王室。诏令司空图入朝。司空图假装失态掉笏，意趣粗野。
会迁洛阳，柳璨希贼臣意，诛天下才望，助丧王室，诏图入朝，图阳堕笏，趣意野耄。
At that time, the capital was relocated to Luoyang. Liu Can complied with the bandit’s will, framed people with talents and reputations, and helped weaken the Imperial House. An imperial edict ordered Sikong Tu to come to court. Sikong Tu pretended to lose his jade tablet by mistake and acted in a rustic way.