Su Qin
In 287 BC Su Dai, the younger brother of Su Qin and possibly an agent of Yan, persuaded King Min that the Zhao war would only benefit Qin. King Min agreed and formed a 'vertical' alliance with the other states against Qin. Qin backed off, abandoned the presumptuous title of "Di", and restored territory to Wei and Zhao. In 286 Qi annexed the state of Song.