for a hostile foreign power; or attempting to kill its head of state. A person who commits treason is known in law as a traitor.

Historically, in common law countries, treason also covered the murder of specific social superiors, such as the murder of a husband by his wife or that of a master by his servant. Treason (i.e., disloyalty) against one's monarch was known as high treason and treason against a lesser superior was petty treason.