regicide

The word "regicide" comes from Latin roots meaning "king-killer." In English, it usually means the killing of a king or queen, and by extension it can also mean the person who carries out that act. The word is strongly tied to monarchy, so it is not normally used for the killing of presidents, generals, or other non-royal leaders. It is also usually about an actual killing, not simply removing a ruler from power.

Historically, the word carries heavy political force. Killing a monarch was often seen not just as a crime against one person, but as an attack on the state, the crown, and the social order built around it. In societies that believed in the divine right of kings, it could also be treated as an offense against sacred authority. Because of that, accusations of regicide could shape wars, trials, and major political struggles.

You will most often see the word in historical writing, literary discussion, and serious narrative prose. The execution of Charles I in England and the execution of Louis XVI during the French Revolution are famous examples. In literature, Macbeth is one of the best-known stories built around the murder of a ruler and the ruin that follows. The word often brings with it ideas of conspiracy, rebellion, guilt, and sudden change in power.

In modern use, the core meaning stays clear: it is about the killing of a monarch. Writers may sometimes stretch it for dramatic effect, but that is secondary and not the standard sense. Whether it is presented as tyranny being overthrown or as a shocking crime, the word suggests the most extreme possible attack on royal authority.