The Yanagawa Ikken was an incident in which Yoshinari SO, the lord of the Tsushima Domain, and his chief retainer Shigeoki YANAGAWA confronted each other over forgery of the sovereign's message exchanged between Japan and Joseon Dynasty in the early Edo period.
柳川一件（やながわいっけん）とは、江戸時代初期に対馬藩主宗義成（そうよしなり）と家老柳川調興（やながわしげおき）が日本と李氏朝鮮の間で交わされた国書の偽造を巡って対立した事件。