Monarchy

A monarchy is a hereditary arrangement in which the position of head of state, which may or may be associated with political power, is legally passed on to a family member of the monarch, a head of state who reigns for life. While most monarchs gain their position based on various hereditary succession laws, they can occasionally gain their authority via election.

Monarchies have historically been a common form of government. Nearly half of all independent states at the start of the 19th century were monarchies. After reaching a peak in the middle of the 19th century, the proportion of monarchies in the world has steadily declined. Republics replaced many monarchies, notably at the end of World War I and World War II.

There are conventionally two types of monarchy: absolute monarchy and constitutional monarchy. Absolute monarchies, of which there are approximately twelve, are governed as autocracies. Most of the modern monarchies are constitutional monarchies, retaining under a constitution unique legal and ceremonial roles for monarchs exercising limited or no political power, similar to heads of state in a parliamentary republic.

As of 2025, forty-three sovereign nations in the world have a monarch, including fifteen Commonwealth realms that share King Charles III as their head of state. Other than that, there is a range of sub-national monarchical entities.