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Monarchy

Form of government ruled by a monarch, or a polity with this form of government

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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.

Etymology

The word monarch first appeared in English in the mid-15th century as monark, meaning "a supreme governor for life, a sole or autocratic ruler of a state." It comes from the Old French monarche (14th century, Modern French monarque) and directly from the Late Latin monarcha, which in turn derives from the Greek μόναρΧος (monarkhos), meaning "one who rules alone" (see monarchy). The term monarchy dates back to the mid-14th century, when it referred to a kingdom or territory ruled by a monarch, and by the late 14th century it also meant rule by a single person with supreme power. It comes from Old French monarchie (13th century), meaning "sovereignty" or "absolute power," which was borrowed from Late Latin monarchia and ultimately from Greek μοναρΧία (monarkhia), "absolute rule", literally "ruling of one," from μόνος (monos) ("alone") and ἄρχειν (arkhein) ("to rule").

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