《旧唐书·本纪·卷十二》
皇上认为奉天狭窄小，想要到凤翔。八日，凤翔军叛乱，叛军将节度使张镒被杀以后，叛乱才停止。
上以奉天隘，欲幸凤翔，壬子，凤翔军乱，杀节度使张镒，乃止。
The Emperor finding Fengtian too cramped, wished to go to Fengxiang. On the 8th day, the troops of Fengxiang mutinied, and the mutiny only ceased after the killing of the Military Governor Zhang Yi.