The 
monarchy of the United Kingdom, commonly referred to as the 
British monarchy, is the 
constitutional form of government by which a 
hereditary sovereign reigns as the 
head of state of the 
United Kingdom, the 
Crown Dependencies (the 
Bailiwick of Guernsey, the 
Bailiwick of Jersey and the 
Isle of Man) and the 
British Overseas Territories.  The current monarch is 
King Charles III, who ascended the throne on 8 September 2022, upon the death of his mother, 
Queen Elizabeth II.
The monarch and 
their immediate family undertake various official, ceremonial, diplomatic and representational duties. As the monarchy is constitutional, the monarch is limited to functions such as bestowing 
honours and 
appointing the 
prime minister, which are performed in a non-partisan manner. The monarch is also 
Head of the British Armed Forces. Though the ultimate executive authority over the government is still formally by and through the 
royal prerogative, these powers may only be used according to laws enacted in Parliament and, in practice, within the constraints of convention and 
precedent. The 
Government of the United Kingdom is known as 
His (Her) Majesty's Government.
The British monarchy traces its origins from the 
petty kingdoms of 
Anglo-Saxon England and 
early medieval Scotland, which consolidated into the kingdoms of 
England and 
Scotland by the 10th century. England was 
conquered by the Normans in 1066, after which 
Wales also gradually came under the control of 
Anglo-Normans. The process was completed in the 13th century when the 
Principality of Wales became a 
client state of the English kingdom. Meanwhile, 
Magna Carta began the process of reducing the English monarch's political powers. From 1603, the English and Scottish kingdoms were ruled by a 
single sovereign. From 1649 to 1660, the tradition of monarchy was broken by the republican 
Commonwealth of England, which followed the 
Wars of the Three Kingdoms. Following the installation of 
William and 
Mary as co-monarchs in the 
Glorious Revolution, the 
Bill of Rights 1689, and its Scottish counterpart the 
Claim of Right Act 1689, further curtailed the power of the monarchy and excluded 
Roman Catholics from succession to the throne. In 1707, the kingdoms of England and Scotland were merged to create the 
Kingdom of Great Britain, and in 1801, the 
Kingdom of Ireland joined to create the 
United Kingdom of Great Britain and Ireland. The British monarch was the nominal head of the vast 
British Empire, which covered a quarter of the world's land area at its greatest extent in 1921.
The 
Balfour Declaration of 1926 recognised the evolution of the 
Dominions of the Empire into separate, self-governing countries within a 
Commonwealth of Nations. In the years after the 
Second World War, the vast majority of British colonies and territories became independent, effectively bringing the Empire to an end. 
George VI and his successors, Elizabeth II and Charles III, adopted the title 
Head of the Commonwealth as a symbol of the free association of its independent member states. The United Kingdom and fourteen other independent sovereign states that share the same person as their monarch are called 
Commonwealth realms. Although the monarch is shared, each country is sovereign and independent of the others, and the monarch has a different, specific, and official national 
title and style for each realm.  Although the term is rarely used today the fifteen Commonwealth realms are in 
personal union.