Regicide refers to the act of killing a king or monarch. This term is derived from the Latin words "rex," meaning king, and "cida," meaning killer. Throughout history, regicide has often been associated with political upheaval, revolutions, or power struggles, where individuals or groups seek to overthrow a ruling authority. Notable examples of regicide include the execution of King Charles I of England in 1649 and the assassination of King Louis XVI of France during the French Revolution. Such acts can lead to significant changes in governance and societal structures, often resulting in the establishment of new regimes or forms of government.