《韩非子·奸劫弑臣》
借着进去探病，用他系帽的带子勒死了楚王，于是自立为楚王。
因入问病，以其冠缨绞王而杀之，遂自立也。
By taking advantage of going in to visit the sick, he strangled the king of Chu with the band of his cap, and then he became the king of Chu himself.