《魏书·帝纪·卷二》
皇帝担心回去后太行山东有变故，就在中山设置行台，诏令左丞相、守尚书令、卫王元仪镇守中山，抚军大将军、略阳公元遵镇守勃海的合口。
帝虑还后山东有变，乃置行台于中山，诏左丞相、守尚书令、卫王仪镇中山，抚军大将军、略阳公元遵镇勃海之合口。
The emperor was worried that there might be trouble east of Mount Taihang after he left, so he established a temporary court in Zhongshan and ordered Left Prime Minister, acting Master of Writing, and King Yuan of Wei to guard Zhongshan and General-Pacifying-the-Army, Duke Gong of Liaoyang, to guard Hehai's Hekou.