东周武公 / Dongzhou Wugong
东周武公 / Dongzhou Wugong enters the wiki through 《资治通鉴·周纪》76丨谁给了楚顷襄王的自信？ as the envoy 周赧王 sends after hearing that 楚国 may attack the 周王室. He goes to Chu’s令尹昭子 and argues that attacking Zhou would not pay.
His persuasion is a compact case of Zhou royal symbolic deterrence. Zhou’s land and people are too small to make Chu richer or stronger, but the royal house still carries the name of the Son of Heaven; an attack could look like regicide, and taking 九鼎 could bring wider military pressure against Chu.