伍子胥
After the fall of Ying, Shen Baoxu, an official of Chu and a former friend of Wu Zixu, went to the State of Qin to plead for assistance. At first the Qin ruler Duke Ai refused to help, but after Shen spent seven days crying in the palace courtyard, Duke Ai was moved by his devotion and agreed to send troops to assist Chu.