regicide

The killing of a king.

One who kills a king.

The killing of a king.

A king-killer; one who puts a king to death; specifically, in English history, a member of the high court of justice constituted by Parliament for the trial of Charles I., by which he was found guilty of treason and sentenced to death in 1649.

One who kills or who murders a king; specifically (Eng. Hist.), one of the judges who condemned Charles I. to death.

The killing or the murder of a king.

The killing of a king.

One who kills a king.

someone who commits regicide; the killer of a king

the act of killing a king