《左传·昭公·昭公元年》
十一月初四日，公子围到达，进宫问候楚王的病情，把楚王勒死了，并乘机杀了他的两个儿子幕和平夏。
十一月己酉，公子围至，入问王疾，缢而弑之。遂杀其二子幕及平夏。
In the fourth day of November, Viscount Wei arrived, visited the King of Chu in the palace, strangled him to death and killed his two sons Mu and Pingxia.