冯喜 / Feng Xi (Warring States)
冯喜 / Feng Xi appears in 《资治通鉴·周纪》38丨搞兼职的张仪不一般 as 张仪’s retainer. After 齐国 attacks 魏国, Zhang Yi sends Feng Xi under a 楚国 diplomatic identity to tell the Qi ruler how Zhang Yi had earlier persuaded 秦武王 to let him go to Wei.
His role is small but structurally important. Feng Xi is the messenger who turns a hidden design into an open signal, making Qi ask whether continuing the war would merely fulfill Zhang Yi’s plan. For the wiki, he belongs mainly to 阴谋阳谋转换 and 纵横家外交 rather than to a standalone biography.