《旧唐书·本纪·卷十一》
十三日，以尚书左丞蒋涣为华州刺史，充任镇国军潼关防御使。
甲申，以尚书左丞蒋涣为华州刺史，充镇国军潼关防御使。
On the 13th, Jiang Huan, the Left Chancellor of the Ministry of War, was appointed as the Prefect of Huazhou and concurrently served as the Prefect of Tongguan for the Town Guard Army.