《三国志·魏书·武文世王公传》
嘉平元年，兖州刺史令狐愚和太尉王凌密谋要迎曹彪为帝，定都许昌。
嘉平元年，兖州刺史令狐愚与太尉王凌谋迎彪都许昌。
In the first year of the Jiaping era, Inspector of Yanzhou Linghu Yu and Grand Commandant Wang Ling secretly plotted to make Cao Biao emperor in Xuchang.