The form of government headed by a king is

A monarchy is a form of government headed by a king or queen, who usually inherits the position and has the power to rule the country. In a monarchy, the monarch is considered the head of state and often has ceremonial duties and represents the country in international affairs. The power of the monarch may be limited by a constitution or laws, and there may also be a parliamentary system in place to help make decisions and laws. This form of government has a long history and is still used in some countries today.