Fan Zuo 范座 was a counsellor-in-chief of Wei 魏. Yu Qing 虞卿, minister of Zhao 趙, intrigued against Fan Zuo and caused the King Anxi of Wei 魏安釐王 (r. 276-243) to arrest Fan Zuo. From the jail, Fan Zuo sent a letter to Lord Xinling 信陵君 and warned him of the machinations of Yu Qing that would endanger the safety of the state of Wei. Lord Xinling thereupon asked the King Anxi to set Fan Zuo free.