《资治通鉴·梁纪·梁纪一》
高肇游说宣武帝，让宿卫队的头领率领羽林虎贲监守各藩王的宅第，差不多把他们幽禁起来了，彭城王元勰再三劝谏不要这样做，但是宣武帝根本不听。
高肇说帝，使宿卫队主帅羽林虎贲守诸王第，殆同幽禁。彭城王勰切谏，不听。
Gao Zhao convinced Xuanwu Emperor to have the leaders of the palace guard lead the Yulin Huben to guard the residences of the feudal kings, essentially putting them under house arrest. Pengcheng King Yuan Xie repeatedly advised against this, but Xuanwu Emperor refused to listen.