Crown Prince of the state of [[燕|燕|yan1]] during the Warring States period who died in 226 BC; he famously commissioned [[荆轲|荊軻|jing1 ke1]] to assassinate the King of [[秦|秦|qin2]], who later became the First Emperor [[秦始皇|秦始皇|qin2 shi3 huang2]]