United Kingdom

The Roman conquest of Britain began in earnest in AD 43 under the emperor Claudius, drawing the lowland zone of the island into the Roman world for almost four hundred years. Roman Britannia built towns, roads, villas, and a frontier marked by Hadrian's Wall, before imperial authority was withdrawn around AD 410 as Rome itself came under strain. The departure of the legions left the province exposed and its Romanised order in decline.

Over the following centuries Germanic-speaking peoples — Angles, Saxons, and Jutes — settled across what became England, forming a patchwork of kingdoms such as Wessex, Mercia, and Northumbria. From the late eighth century onward, Viking raids and then large-scale Scandinavian settlement transformed the political map, overrunning most of the Anglo-Saxon kingdoms. Alfred the Great of Wessex (reigned 871–899) checked the Viking advance, most decisively at the Battle of Edington in 878, and laid the groundwork for a unified English realm.

Alfred's successors pressed northward, and his grandson Athelstan is widely regarded as the first king to rule all of England after he took the Viking kingdom of York in 927. The kingdom that emerged was wealthy, literate, and administratively sophisticated, but it remained a prize fought over by rival dynasties. In 1066 the death of Edward the Confessor without a clear heir set off the succession crisis that would end Anglo-Saxon England.

Turning points

1. AD 43 — 43 — War & Rupture:

   Roman conquest of Britain begins

   The emperor Claudius launched the Roman invasion of Britain, beginning nearly four centuries of Roman rule over the province of Britannia, with its towns, roads, and the frontier of Hadrian's Wall.

   ↗See the data

   [4] [7]

2. c. AD 410 — 410 — Politics & Power:

   End of Roman Britain

   Roman authority was effectively withdrawn from Britain around 410, after which the former province fragmented and Germanic-speaking peoples gradually settled across what became England.

   [4]

3. 878 — War & Rupture:

   Alfred defeats the Vikings at Edington

   Alfred the Great of Wessex won a decisive victory over the Viking 'Great Heathen Army' at Edington, securing the survival of Anglo-Saxon rule in southern England and beginning the path to unification.

   ↗See the data

   [5] [8]

4. 927 — Formation:

   England unified under Athelstan

   By capturing Viking-held York and securing the submission of other rulers, Athelstan became the first king to rule over all of England, forging a single English kingdom.

   [6] [7]

Figures of the era

On 14 October 1066 Duke William of Normandy defeated King Harold II at the Battle of Hastings; Harold was killed and, on Christmas Day, William was crowned in Westminster Abbey. The Norman Conquest replaced the Anglo-Saxon aristocracy almost wholesale with Norman lords, introduced feudal landholding and castle-building, and infused English with thousands of French words. The great land survey known as Domesday Book, compiled in 1086, recorded the conquerors' grip on their new kingdom.

Norman and later Angevin kings ruled lands on both sides of the Channel, embroiling England in continental politics and war. Tension between the crown and its barons came to a head in 1215, when rebellious nobles forced King John to seal Magna Carta at Runnymede. Though John promptly repudiated it, the charter's principle that the king was subject to the law endured, and it became a touchstone of later constitutional argument. The thirteenth and fourteenth centuries also saw the emergence of Parliament as an institution that the crown needed to consult, especially over taxation.

The later Middle Ages were scarred by catastrophe and conflict. The Black Death, which reached England in 1348, killed a large share of the population within a few years and reshaped the economy and the bonds of serfdom. The Hundred Years' War with France (1337–1453) and the dynastic Wars of the Roses (1455–1487) drained the realm, until Henry Tudor's victory at Bosworth in 1485 ended the Plantagenet line and opened a new chapter.

Turning points

1. 25 September 1066 — 1066 — War & Rupture:

   Harold defeats Harald Hardrada at Stamford Bridge

   Harold Godwinson beat the Norwegian king Harald Hardrada and his own brother Tostig at Stamford Bridge near York, days before William of Normandy landed in Sussex on 28 September.

   ↗See the data

   [50]

2. 14 October 1066 — 1066 — War & Rupture:

   Battle of Hastings and the Norman Conquest

   William of Normandy defeated and killed King Harold II at Hastings and was crowned king on Christmas Day, beginning Norman rule and transforming England's language, law, and aristocracy.

   ↗See the data

   [9] [7]

3. 1086 — Politics & Power:

   Domesday Book compiled

   William the Conqueror ordered a comprehensive survey of landholding in England, producing Domesday Book, an unparalleled record of the kingdom's wealth and the new Norman order.

   [8]

4. 1204 — War & Rupture:

   Normandy lost; the Channel Islands stay with the Crown

   Philip II of France conquered mainland Normandy from King John in 1204, but the Channel Islands remained loyal to the English Crown, which still holds them as Crown Dependencies.

   ↗See the data

   [51] [52]

5. 15 June 1215 — 1215 — Politics & Power:

   Magna Carta sealed at Runnymede

   Rebel barons compelled King John to seal Magna Carta, asserting that the monarch was bound by law; though soon annulled, it became a lasting symbol of limits on royal power.

   [8] [10]

6. 1348–1349 — 1348 — Catastrophe:

   The Black Death reaches England

   The plague pandemic killed a large proportion of England's population within a few years, devastating communities and accelerating long-term changes in labour and society.

   ↗See the data

   [8]

7. 1362 — Politics & Power:

   Pleading in English Act

   Parliament ruled that all pleas in the courts be pleaded and judged in English, because French was too little known among ordinary people, ending nearly three centuries of French as the language of court proceedings (records stayed in Latin).

   [53] [54]

8. 13 October 1399 — 1399 — Politics & Power:

   Henry IV claims the crown in English

   At his coronation Henry IV reportedly addressed the assembly in English, the first such royal address in English recorded since the Norman Conquest.

   [55]

9. 22 August 1485 — 1485 — War & Rupture:

   Battle of Bosworth ends the Wars of the Roses

   Henry Tudor defeated Richard III at Bosworth Field, ending the Plantagenet dynasty and the Wars of the Roses and founding the Tudor line as Henry VII.

   ↗See the data

   [11]

Figures of the era

The Tudor century opened with Henry VII restoring royal authority after decades of civil war. His son Henry VIII set in motion the English Reformation when the pope refused to annul his marriage to Catherine of Aragon. The Act of Supremacy of 1534 declared the king Supreme Head of the Church of England, severing papal jurisdiction; the dissolution of the monasteries that followed transferred vast wealth and land to the crown and its supporters and reshaped religious life across the realm.

Religion remained bitterly contested through the short reigns of the Protestant Edward VI and the Catholic Mary I before Elizabeth I (reigned 1558–1603) established a lasting, if disputed, settlement that fixed England as a Protestant nation. Elizabeth's reign became associated with a flowering of English culture — above all the theatre of William Shakespeare and Christopher Marlowe — and with rising national confidence.

That confidence was sealed by the defeat of the Spanish Armada in 1588, when England repelled Philip II's great invasion fleet. The Elizabethan age also saw the first stirrings of English overseas expansion: chartered companies, privateering voyages, and early, often failed, attempts at colonisation. These ventures drew England — and soon Britain — into the Atlantic world of trade, settlement, and, increasingly, the traffic in enslaved Africans that would define the empire to come.

Turning points

1. 1534 — Religion:

   Act of Supremacy and the break with Rome

   Parliament declared Henry VIII Supreme Head of the Church of England, ending papal authority in England and launching the English Reformation and the dissolution of the monasteries.

   [12] [13]

2. 1535–1542 — 1536 — Politics & Power:

   The Laws in Wales Acts incorporate Wales into England

   Two Acts of Henry VIII's Parliament (27 Hen. 8 c. 26, cited as 1535, and 34 & 35 Hen. 8 c. 26 of 1542) declared Wales incorporated with England, extended English law and administration to it, and divided it into twelve shires. The 1535 Act was repealed on 21 December 1993.

   [46] [47]

3. 1559 — Religion:

   The Elizabethan Religious Settlement

   Elizabeth I's settlement re-established royal headship of the Church and a Protestant order, ending decades of religious upheaval and shaping the Church of England for centuries.

   [14]

4. 1588 — War & Rupture:

   Defeat of the Spanish Armada

   England repelled the Spanish Armada sent by Philip II, a decisive check to Spanish ambitions that bolstered English naval confidence and national identity.

   ↗See the data

   [15]

5. 31 December 1600 — 1600 — Economy & Trade:

   Founding of the East India Company

   A royal charter created the East India Company for trade with Asia; over the following centuries it grew into an instrument of conquest that brought much of India under British control.

   ↗See the data

   [16]

Figures of the era

When Elizabeth I died childless in 1603, James VI of Scotland inherited the English throne as James I, uniting the two crowns in one person while the kingdoms remained legally separate. Conflict between the Stuart kings and Parliament over money, religion, and the limits of royal authority erupted into the English Civil War in 1642. Parliament's victory led to an extraordinary act: the public trial and execution of King Charles I in 1649, followed by a republican Commonwealth under Oliver Cromwell. The monarchy was restored in 1660, but the fundamental dispute remained unresolved.

It was settled by the Glorious Revolution of 1688, when the Catholic James II was driven out and Parliament invited William of Orange and Mary to take the throne on terms. The Bill of Rights of 1689 limited the crown's powers and affirmed the authority of Parliament, establishing the constitutional monarchy that endures in modified form today. In 1707 the Acts of Union joined the parliaments and kingdoms of England and Scotland into the single Kingdom of Great Britain, governed from Westminster.

The eighteenth century saw Britain rise as a commercial and naval power, financed in part by Atlantic trade. British ships carried enslaved Africans in vast numbers across the Atlantic to plantation colonies in the Caribbean and the Americas, and the profits of slave-grown sugar, tobacco, and cotton enriched British ports and merchants. Victory in the Seven Years' War (1756–1763) made Britain the dominant European power in North America and India, even as taxation disputes with the thirteen American colonies pushed them toward revolt — a revolt that, by 1783, cost Britain its most populous overseas possessions.

Turning points

1. 1603 — Politics & Power:

   Union of the Crowns

   James VI of Scotland succeeded Elizabeth I as James I of England, uniting the English and Scottish crowns under one monarch while the two kingdoms remained separate states.

   [8]

2. 30 January 1649 — 1649 — War & Rupture:

   Execution of Charles I

   After defeat in the English Civil War, Charles I was tried and beheaded, and a republican Commonwealth was established — a singular assertion of Parliament's power over the crown.

   ↗See the data

   [17]

3. 1688 — Politics & Power:

   The Glorious Revolution

   James II was deposed and William and Mary took the throne on Parliament's terms; the Bill of Rights of 1689 entrenched parliamentary authority and constitutional monarchy.

   [18]

4. 1 May 1707 — 1707 — Formation:

   Acts of Union create Great Britain

   The Acts of Union merged the kingdoms and parliaments of England and Scotland into a single Kingdom of Great Britain, governed by one Parliament at Westminster.

   [19] [20]

5. 1783 — Independence:

   Loss of the American colonies

   The Treaty of Paris recognised the independence of the United States, ending the American Revolutionary War and stripping Britain of its thirteen mainland colonies.

   ↗See the data

   [8]

Figures of the era

From around 1760 Britain underwent an industrial revolution that, over the following century, transformed it into the 'workshop of the world'. Coal, steam power, mechanised textile manufacture, railways, and ironworking concentrated people in fast-growing industrial cities and made Britain the world's leading manufacturing economy. Industrialisation brought immense wealth and new technologies, but also harsh factory conditions, child labour, and squalid urban poverty that spurred reform movements over the nineteenth century.

Britain's overseas empire expanded enormously, and a second union reshaped the state at home: the union with Ireland, effective 1 January 1801, created the United Kingdom of Great Britain and Ireland. The empire's foundations were deeply entangled with slavery. Britain had been a leading slave-trading nation; Parliament abolished the British transatlantic slave trade in 1807 and then slavery itself across most of the empire under the Slavery Abolition Act of 1833, which took effect in 1834 and compensated slave-owners — not the enslaved — for their losses.

Under Queen Victoria (reigned 1837–1901) the empire reached its zenith, eventually covering roughly a quarter of the world's land and population. Imperial rule could be catastrophic for colonised peoples. In Ireland, the Great Famine of 1845–1852 killed about a million people and drove a million more to emigrate, a disaster made far worse by the inadequacy and ideology of the government's response. In India, the East India Company's rule gave way to direct Crown control after the rebellion of 1857. British power abroad rested on industrial strength, financial dominance, and the Royal Navy — supremacy that would be tested by the rivalries leading to the First World War.

Turning points

1. 1 January 1801 — 1801 — Formation:

   Union with Ireland forms the United Kingdom

   The Acts of Union 1800 merged the kingdoms of Great Britain and Ireland, creating the United Kingdom of Great Britain and Ireland and abolishing the separate Irish parliament.

   [21] [22]

2. 1807 — Politics & Power:

   Abolition of the British slave trade

   The Slave Trade Act prohibited the Atlantic slave trade across the British Empire, though it did not free those already enslaved in British colonies.

   [23]

3. 1833 — Politics & Power:

   Slavery Abolition Act

   Parliament abolished slavery across most of the British Empire, effective 1834, freeing more than 800,000 people while compensating former slave-owners rather than the enslaved.

   [23]

4. 1837–1901 — 1837 — Politics & Power:

   The Victorian era and the height of empire

   During Queen Victoria's long reign Britain became the world's foremost industrial and imperial power, its empire eventually spanning about a quarter of the globe.

   [26] [27]

5. 1845–1852 — 1845 — Catastrophe:

   The Great Irish Famine

   Potato blight and an inadequate, laissez-faire government response caused mass starvation in Ireland, killing roughly a million people and forcing about a million more to emigrate.

   ↗See the data

   [24] [25]

Figures of the era

The First World War (1914–1918) cost Britain and its empire enormous numbers of lives and accelerated political change at home, including the extension of the vote to women. In its aftermath, most of Ireland broke away: after the War of Independence, the Anglo-Irish settlement created the Irish Free State in 1922, leaving Northern Ireland within the United Kingdom and renaming the state the United Kingdom of Great Britain and Northern Ireland.

The Second World War (1939–1945) saw Britain stand against Nazi Germany, endure the Blitz, and emerge victorious but financially exhausted. The war also exposed the brutal costs of empire: the Bengal famine of 1943 killed an estimated two to three million people in British India, worsened by wartime policy and administrative failure. At home, the post-war Labour government built a welfare state, founding the National Health Service in 1948 to provide healthcare free at the point of use.

The decades after 1945 brought the rapid dismantling of empire. India and Pakistan became independent in 1947, followed by dozens of colonies across Asia, Africa, and the Caribbean, many of them joining the Commonwealth. Post-war labour shortages were met partly by immigration from the Caribbean and South Asia, reshaping British society. Britain joined the European Communities in 1973.

In recent decades the United Kingdom devolved power to Scotland, Wales, and Northern Ireland, where the Good Friday Agreement of 1998 brought a hard-won peace after the long conflict known as the Troubles. In a 2016 referendum the UK voted to leave the European Union, which it formally did on 31 January 2020. The country remains a constitutional monarchy and parliamentary democracy, a permanent member of the UN Security Council, and an actor of global reach, while continuing to debate the shape of its union and its place in the world.

Turning points

1. 1914–1918 — 1914 — War & Rupture:

   The First World War

   Britain and its empire fought in the First World War at enormous human cost; the war accelerated social and political change, including votes for women, and led to the partition of Ireland and the Irish Free State in 1922.

   ↗See the data

   [28] [22]

2. 22 June 1921 — 1921 — Formation:

   Northern Ireland's Parliament opens

   Under the Government of Ireland Act 1920, which defined Northern Ireland as the six counties of Antrim, Armagh, Down, Fermanagh, Londonderry and Tyrone, George V opened the Parliament of Northern Ireland in Belfast City Hall; unionists had won 40 of its 52 seats.

   [32] [33]

3. 12 April 1927 — 1927 — Politics & Power:

   The Royal and Parliamentary Titles Act renames the state

   The Act changed the style of Parliament to 'of the United Kingdom of Great Britain and Northern Ireland' and let the Crown alter its royal style; the proclamation followed on 13 May 1927.

   [48]

4. 1939–1945 — 1939 — War & Rupture:

   The Second World War

   Britain fought Nazi Germany and the Axis, endured the Blitz, and emerged victorious but economically drained; the wartime Bengal famine of 1943 killed millions in British India.

   ↗See the data

   [28] [29]

5. 1947 — Independence:

   Independence of India and the start of decolonisation

   India and Pakistan became independent, beginning the rapid dismantling of the British Empire as dozens of colonies gained independence over the following decades.

   ↗See the data

   [28]

6. 5 July 1948 — 1948 — Politics & Power:

   Founding of the National Health Service

   The post-war Labour government launched the NHS, providing healthcare free at the point of use and forming the centrepiece of Britain's new welfare state.

   [30]

7. 2 June 1949 — 1949 — Politics & Power:

   Ireland Act affirms Northern Ireland's status

   Recognising that Éire had ceased to be part of His Majesty's dominions on 18 April 1949, the Ireland Act affirmed that Northern Ireland would not cease to be part of the United Kingdom without the consent of the Parliament of Northern Ireland.

   [34]

8. 10 Sep 1967 — 1967 — Politics & Power:

   Gibraltar votes to stay British

   In a sovereignty referendum Gibraltarians chose to keep their link with Britain rather than pass under Spanish sovereignty, by 12,138 votes to 44; Spain responded by closing the land frontier in 1969.

   [2] [1]

9. 1969–1998 — 1969 — War & Rupture:

   The Troubles in Northern Ireland

   Three decades of conflict over Northern Ireland's constitutional status followed the civil rights protests of 1968. The Sutton Index records 3,532 deaths between July 1969 and 2001: 58 per cent caused by republican paramilitaries, 29 per cent by loyalist paramilitaries and 10 per cent by the British security forces.

   ↗See the data

   [35] [36]

10. 9 August 1971 — 1971 — Politics & Power:

    Internment without trial

    Internment was introduced in Northern Ireland and used at first only against republicans; of 1,981 people detained before it ended in December 1975, 1,874 were Catholic or republican and 107 Protestant or loyalist. In Ballymurphy over the following days ten civilians were shot dead, nine of them by the Army, whom a 2021 inquest found 'entirely innocent'.

    [37] [38]

11. 30 March 1972 — 1972 — Politics & Power:

    Direct rule from Westminster

    Edward Heath's government prorogued the Stormont Parliament and imposed direct rule on Northern Ireland from Westminster.

    [39]

12. 10 April 1998 — 1998 — Politics & Power:

    The Belfast (Good Friday) Agreement

    The British and Irish governments and Northern Ireland parties agreed power-sharing and the principle of consent, given effect by the Northern Ireland Act 1998: Northern Ireland remains in the UK unless a majority of its people vote otherwise in a poll. Referendums on 22 May 1998 approved it by 71.1 per cent in Northern Ireland and 94.4 per cent in the Republic of Ireland.

    [40] [41]

13. 7 Nov 2002 — 2002 — Politics & Power:

    Gibraltar rejects shared sovereignty

    In a referendum called by the Gibraltar Government, voters rejected a proposal for British–Spanish joint sovereignty by 17,900 votes to 187.

    [3]

14. 12 December 2012 — 2012 — Politics & Power:

    De Silva review of the Finucane murder

    A government-commissioned review of the 1989 killing of the Belfast solicitor Pat Finucane by the loyalist UDA found 'frankly shocking levels of state collusion' though no 'over-arching State conspiracy'; the Prime Minister apologised to his family.

    [42]

15. 31 January 2020 — 2020 — Politics & Power:

    The United Kingdom leaves the European Union

    Following the 2016 referendum, the UK formally withdrew from the European Union, ending nearly half a century of membership in the European project.

    [31]

16. 27 February 2023 — 2023 — Politics & Power:

    The Windsor Framework

    Northern Ireland, which voted 55.8 per cent to remain in the 2016 referendum, was kept aligned with EU goods rules after Brexit; the UK and EU's Windsor Framework added a 'green lane' for goods staying in the UK and a 'Stormont brake' requiring 30 Assembly members from at least two parties.

    [43] [44]

Figures of the era