《资治通鉴·隋纪·隋纪八》
乙巳，灵寿县的贼帅郗士陵统帅部众几千人归降李渊。李渊封郗士陵为镇东将军、燕郡公，仍设置镇东府，补充镇东府的僚属，以此招抚潼关以东各郡县。
乙巳，灵寿贼帅郗士陵帅众数千降于渊，渊以为镇东将军、燕郡公，仍置镇东府，补僚属，以招抚山东郡县。
On Yisi, Xi Shiling, the leader of the rebels in Lingshou County, led a few thousand of his men to surrender to Li Yuan. Li Yuan enfeoffed Xi Shiling as General of the Pacification of the East and Duke of Yangu, and reinstated the General's Office of the Pacification of the East, replenishing its staff and using it to pacify all of the commanderies and counties east of Tongguan Pass.