Monarchy

A monarchy is a hereditary form of government in which political power is legally passed on to the family members of the monarch, a head of state who rules for life. While monarchs gain their power depending on specific succession laws, they can also 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.