Regicide is a the deliberate killing of a king by one of his subjects. It has particular resonance within the concept of the Divine Right of Kings, whereby monarchs were presumed by decision of God to have a divinely anointed authority to rule. As such, an attack on a king by one of his own subjects was taken to amount a direct challenge to (i) the monarch, (ii) his Divine Right to Rule, and (iii) God's will. Even after the disappearance of the Divine Right of Kings and the appearance of Constitutional Monarchies, the term continued and continues to be used to describe the murder of a king by one of his subjects or citizens. The word is applied to the killer as well as the act: in English history it is applied also to those who signed the death warrant for Charles I of England.
Seven famous historical regicides were the executions or deliberate assassinations of
More recently, King Birendra of Nepal was killed in the massacre of the Nepalese royal family in 2001 by his own son, the Crown Prince Dipendra.