Portrait of Ruler. A monarch is the head of state in a monarchy.
A monarch may exercise the highest authority and power in the state, or others may wield that power on behalf of the monarch. Usually a monarch either personally inherits the lawful right to exercise the state's sovereign rights or is selected by an established process from a family or cohort eligible to provide the nation's monarch.
Alternatively, an individual may become monarch by right of conquest, acclamation or a combination of means. A monarch usually reigns for life or until abdication.
If a young child is crowned the monarch, a regent is often appointed to govern until the monarch reaches the requisite adult age to rule. Monarchs' actual powers vary from one monarchy to another and in different eras; on one extreme, they may be autocrats wielding genuine sovereignty; on the other they may be ceremonial heads of state who exercise little or no direct power or only reserve powers, with actual authority vested in a parliament or other body.
A monarch can reign in multiple monarchies simultaneously. For example, the monarchy of Canada and the monarchy of the United Kingdom are separate states, but they share the same monarch through personal union. Monarchs, as such, bear a variety of titles-king or queen, prince or princess, emperor or empress, archduke, duke or grand duke, emir, sultan, or a pharaoh. King is mostly used as a