The deliberate killing of a monarch.
The man committed regicide.
A murderer; traitor; assassin; treason
regicide
He was accused of regicide (the killing of a king).
The killing of a king
Regicide is the murder of a king.
Regicide is the word used to describe the murder of a king.
It's still called regicide
Google: etymology hope it help :)
The man comided regicide on linken
The killing of a King is called regicide - an example of regicide was Oliver Cromwell beheading King Charles I of England.
Thomas Chaloner - regicide - died in 1661.