Su Qin
The Qi State took advantage of the Yan State and installed a new monarch, King Yi, as well occupying ten cities which the King of Wei asked Su Qin to get back. Su Qin petitioned the King of Qi thus: "The King of Yan is a kinsman of the Qi State and you have snatched his territory. This is bound to draw the elite troops of the Qin State so you must return these cities!"