《旧唐书·本纪·卷三》
夏四月三日，太子太师、赵国公长孙无忌，太子太傅、梁国公房玄龄，太子太保、宋国公萧王禹各人都辞去太子太师、太子太傅、太子太保的职务，皇上诏令同意。
夏四月甲子，太子太师、赵国公长孙无忌，太子太傅、梁国公房玄龄，太子太保、宋国公萧瑀各辞调护之职，诏许之。
On the 3rd day of the fourth month (Summer), Grand Preceptor to the Crown Prince and Duke of Zhao, Changsun Wuji, Grand Tutor to the Crown Prince and Duke of Liang, Fang Xuanling, and Grand Guardian to the Crown Prince and Duke of Song, Xiao Wangyu, all resigned from their positions, and the emperor approved by imperial edict.