United Kingdom

The Kingdom of England emerged in 927 when Aethelstan of Wessex united the Anglo-Saxon kingdoms into a single realm. It was transformed by the Norman Conquest of 1066 under William the Conqueror, which brought feudal institutions from the continent and fused Norman-French and Anglo-Saxon cultures. Over subsequent centuries English monarchs fought wars in France, faced baronial revolts that produced Magna Carta in 1215, and built institutions — Parliament and common law — that shaped constitutional governance. England incorporated Wales and contested Scotland, fought the Hundred Years' War with France, and experienced the Tudor Reformation that severed ties with Rome. The seventeenth century brought civil war, the execution of Charles I, and the Glorious Revolution of 1688. The Acts of Union 1707 merged England and Scotland into the Kingdom of Great Britain, itself united with Ireland in 1801 to form the United Kingdom. Formed by the Acts of Union of 1800 merging Great Britain and Ireland, the United Kingdom was Napoleon's most persistent enemy and the only major power never defeated by him. British naval supremacy (secured at Trafalgar in 1805) and financial power—funding successive coalitions—proved decisive in Napoleon's eventual defeat.

• Existed: 927 CE – present
• Type: Entity
• Government: Parliamentary Monarchy
• Capital: London