Who is the leader of monarchy?

The head of state in a constitutional monarchy is the MONARCH, who may take a title of "King", "Queen", "Prince", "Princess", "Sultan", "Emperor", "Caliph", "Maharaja", or "Emir". The head of government, however, depends on the style of government established to curtail the Monarch's power. Usually it will be a PRIME MINISTER or similar person with a different title (e.g. CHANCELLOR) who represents an elected parliament, but it can be a leading oligarch or aristocrat.