Supreme commander-in-chief

The supreme commander-in-chief (supreme commander) is the title of a person holding supreme commanding authority over the armed forces of a state (or coalition of states), usually in wartime and sometimes in peacetime. The supreme commander-in-chief is also vested with extraordinary power in relation to all civilian institutions and persons on the territory of a given state and the theater of military operations (theater of war).

Source: Wikipedia — Supreme commander-in-chief (CC BY-SA 4.0)