《北史·列传·卷十一》
太傅清河王等人上奏说 ：于忠擅自滥杀朝中重要大臣，随意废黜宰相，朝野震惊，远近怪异。
太傅清河王等奏： 忠擅杀枢纳，辄废宰辅，朝野骇心，远近怪愕。
Grand tutor Qinghe Wang and the others put forward a memorial to the throne, saying: Yu Zhong presumptuously and illegally killed important court ministers, and randomly dismissed prime ministers. The court and the common people were shocked, and everyone near and far were surprised.