弒君,大逆,大逆者
Regicide \Reg"i*cide\ (r?j"?*s?d), n. [F. r['e]gicide; L. rex, regis, a king + caedere to kill. Cf. {Homicide}.] 1. One who kills or who murders a king; specifically (Eng.Hist.), one of the judges who condemned Charles I. to death. 2. The killing or the murder of a king.
regicide n 1: someone who commits regicide; the killer of a king 2: the act of killing a king