Warring States strategist and younger brother of 苏秦. In the 战国策 he talks the King of Zhao out of attacking Yan with the fable 鹬蚌相争: while a snipe and a clam fight, a fisherman catches both.
Su Dai was a famous diplomat-strategist of the Warring States period.
Tips
history
He and 苏秦 were 纵横家, 'vertical and horizontal' strategists, named for the alliances they sold: north-south leagues against Qin or east-west pacts with it. The full saying is 鹬蚌相争,渔翁得利, said when two sides fight and a third walks off with the prize.