List of monarchs in Britain by length of reign

thumb|Elizabeth II delivering a speech at the official opening of the [[Borders Railway, on the day she became the longest-reigning British monarch.]]

The following is a list, ordered by length of reign, of the monarchs of the United Kingdom of Great Britain and Northern Ireland (1927–present), the United Kingdom of Great Britain and Ireland (1801–1922), the Kingdom of Great Britain (1707–1801), the Kingdom of England (871–1707), the Kingdom of Scotland (878–1707), the Kingdom of Ireland (1542–1800), and the Principality of Wales (1216–1542).

Queen Elizabeth II became the longest-reigning monarch in British history on 9 September 2015 when she surpassed the reign of her great-great-grandmother Queen Victoria. On 6 February 2017, she became the first British monarch to celebrate a Sapphire Jubilee, commemorating 65 years on the throne. On 6 February 2022, Elizabeth II became the first British monarch to reign for 70 years, and large-scale celebrations for her Platinum Jubilee occurred on 2 to 5 June. At her death aged 96 later that year, she had reigned for 70 years and 214 days.

Ten longest-reigning British monarchs

These are the ten longest-reigning monarchs in the British Isles for whom there is reliable recorded evidence. This list excludes Constantine II of Scotland who ruled for approximately 43 years from circa 900 to 943.

{| class="wikitable" style="text-align:center"

! rowspan=2 | Rank

! rowspan=2 | Portrait

! rowspan=2 | Monarch

! rowspan=2 | Age at accession

! colspan=2 | Reign

! colspan=2 | Duration

! From

! To

! Days

! Years, days

! 1

| style="text-align:left" | 100px

| Elizabeth II of the United Kingdom

| 6 February 1952

| 8 September 2022

| 25,782

| 70 years, 214 days

! 2

| style="text-align:left" | 100px

| Victoria of the United Kingdom

| 20 June 1837

| 22 January 1901

| 23,226

| 63 years, 216 days

! 3

| style="text-align:left" | 100px

| George III of the United Kingdom

| 25 October 1760

| 29 January 1820

| 21,644

| 59 years, 96 days

! 4

| style="text-align:left" | 100px

| James VI of Scotland

| 24 July 1567

| 27 March 1625

| 21,066

| 57 years, 246 days

! 5

| style="text-align:left" | 100px

| Henry III of England

| 28 October 1216

| 16 November 1272

| 20,473

| 56 years, 19 days

! 6

| style="text-align:left" | 100px

| Edward III of England

| 25 January 1327

| 20 June 1377

| 18,410

| 50 years, 147 days

! 7

| style="text-align:left" |

| William I of Scotland

| ca. 24 years

| 9 December 1165

| 4 December 1214

| 17,892

| 48 years, 360 days

! 8

| style="text-align:left" |

| Llywelyn of Gwynedd

| ca. 22 years

| 1195

| 11 April 1240

| 16,173–16,902

| 44–46 years

! 9

| style="text-align:left" | 100px

| Elizabeth I of England

| 17 November 1558

| 24 March 1603

| 16,198

| 44 years, 127 days

! 10

| style="text-align:left" |

| David II of Scotland

| 7 June 1329

| 22 February 1371

| 15,235

| 41 years, 260 days

Complete list of the unitary monarchy

On 1 May 1707, under the Acts of Union 1707, the Kingdom of England united with the Kingdom of Scotland as the Kingdom of Great Britain. Then, on 1 January 1801, the Kingdom of Great Britain united with the Kingdom of Ireland to become the United Kingdom of Great Britain and Ireland, becoming the United Kingdom of Great Britain and Northern Ireland by Act of Parliament in 1927 following the creation of the Irish Free State in 1922.

{| class="wikitable sortable" style="text-align:center"

! rowspan="2" |Name

! colspan="2" |Reign

! colspan="2" |Duration

!From

!To

!Years, days

!Total days

| align="left" |Elizabeth II

|6 February 1952

|8 September 2022

| align="right" |

| align="left" |Victoria

|20 June 1837

|22 January 1901

| align="right" |

| align="left" |George III

|25 October 1760

|29 January 1820

| align="right" |

| align="left" |George II

|22 June 1727

|25 October 1760

| align="right" |

| align="left" |George V

|6 May 1910

|20 January 1936

| align="right" |

| align="left" |George VI

|11 December 1936

|6 February 1952

| align="right" |

| align="left" |George I

|1 August 1714

|11 June 1727

| align="right" |

| align="left" |George IV

|29 January 1820

|26 June 1830

| align="right" |

| align="left" |Edward VII

|22 January 1901

|6 May 1910

| align="right" |

| align="left" |Anne

|1 May 1707

|1 August 1714

| align="right" |

| align="left" |William IV

|26 June 1830

|20 June 1837

| align="right" |

|- style="background:#9f9"

| align="left" |Charles III

|8 September 2022

|present

| align="right" |

| align="left" |Edward VIII

|20 January 1936

|11 December 1936

| align="right" |

Complete list of the kingdoms

England

thumb|[[Henry III of England|Henry III was the longest-reigning monarch of an independent England.]]

Includes English monarchs from the installation of Alfred the Great as King of Wessex in 871 to Anne (House of Stuart) and the Acts of Union on 1 May 1707, when the crown became part of the Kingdom of Great Britain.

{| class="wikitable sortable" style="text-align:center"

|- style="text-align:center"

! rowspan=2 | Name

! colspan=2 | Reign

! colspan=2 | Duration

! From

! To

! Days

! Years, days

| style="text-align:left" | Henry III

| 28 October 1216

| 16 November 1272

| style="text-align:right" | 20,473

| style="text-align:right" | 56 years, 19 days

| style="text-align:left" | Edward III

| 25 January 1327

| 21 June 1377

| style="text-align:right" | 18,410

| style="text-align:right" | 50 years, 147 days

| style="text-align:left" | Elizabeth I

| 17 November 1558

| 24 March 1603

| style="text-align:right" | 16,198

| style="text-align:right" | 44 years, 127 days

| style="text-align:left" | Henry VI

| 1 September 1422 31 October 1470

| 4 March 1461 11 April 1471

| style="text-align:right" | 14,064 162 Total: 14,226

| style="text-align:right" | 38 years, 184 days 162 days Total: 38 years, 347 days

| style="text-align:left" | Æthelred II

| 18 March 978 3 February 1014

| 25 December 1013 23 April 1016

| style="text-align:right" | 13,065 810 Total: 13,875

| style="text-align:right" | 35 years, 282 days 2 years, 80 days Total: 37 years, 362 days

| style="text-align:left" | Henry VIII

| 22 April 1509

| 28 January 1547

| style="text-align:right" | 13,795

| style="text-align:right" | 37 years, 281 days

| style="text-align:left" | Henry I

| 5 August 1100

| 1 December 1135

| style="text-align:right" | 12,901

| style="text-align:right" | 35 years, 118 days

| style="text-align:left" | Henry II

| 25 October 1154

| 6 July 1189

| style="text-align:right" | 12,673

| style="text-align:right" | 34 years, 254 days

| style="text-align:left" | Edward I

| 20 November 1272

| 7 July 1307

| style="text-align:right" | 12,646

| style="text-align:right" | 34 years, 229 days

| style="text-align:left" |Alfred the Great

| 24 April 871

| 26 October 899

| style="text-align:right" | 10,412

| style="text-align:right" | 28 years, 185 days

| style="text-align:left" | Edward the Elder

| 27 October 899

| 17 July 924

| style="text-align:right" | 9,029

| style="text-align:right" | 24 years, 264 days

| style="text-align:left" | Charles II

| 29 May 1660

| 6 February 1685

| style="text-align:right" | 9,019

| style="text-align:right" | 24 years, 253 days

| style="text-align:left" | Charles I

| 27 March 1625

| 30 January 1649

| style="text-align:right" | 8,710

| style="text-align:right" | 23 years, 309 days

| style="text-align:left" | Henry VII

| 22 August 1485

| 21 April 1509

| style="text-align:right" | 8,642

| style="text-align:right" | 23 years, 242 days

| style="text-align:left" | Edward the Confessor

| 8 June 1042

| 5 January 1066

| style="text-align:right" | 8,612

| style="text-align:right" | 23 years, 211 days

| style="text-align:left" | Richard II

| 22 June 1377

| 29 September 1399

| style="text-align:right" | 8,134

| style="text-align:right" | 22 years, 99 days

| style="text-align:left" | James I

| 24 March 1603

| 27 March 1625

| style="text-align:right" | 8,039

| style="text-align:right" | 22 years, 3 days

| style="text-align:left" | Edward IV

| 4 March 1461 11 April 1471

| 3 October 1470 9 April 1483

| style="text-align:right" | 3,500 4,381 Total: 7,881

| style="text-align:right" | 9 years, 213 days 11 years, 363 days Total: 21 years, 211 days

| style="text-align:left" | William I

| 12 December 1066

| 9 September 1087

| style="text-align:right" | 7,563

| style="text-align:right" | 20 years, 258 days

| style="text-align:left" | Edward II

| 8 July 1307

| 20 January 1327

| style="text-align:right" | 7,136

| style="text-align:right" | 19 years, 196 days

| style="text-align:left" | Cnut

| 30 November 1016

| 12 November 1035

| style="text-align:right" | 6,921

| style="text-align:right" | 18 years, 347 days

| style="text-align:left" | Stephen

| 22 December 1135

| 25 October 1154

| style="text-align:right" | 6,883

| style="text-align:right" | 18 years, 308 days

| style="text-align:left" | John

| 6 April 1199

| 19 October 1216

| style="text-align:right" | 6,406

| style="text-align:right" | 17 years, 196 days

| style="text-align:left" | Edgar I

| 1 October 959

| 8 July 975

| style="text-align:right" | 5,759

| style="text-align:right" | 15 years, 280 days

| style="text-align:left" | Æthelstan

| 2 August 924 (or 925)

| 27 October 939

| style="text-align:right" | 5,564 or 5,199

| style="text-align:right" | 15 years, 86 days or 14 years, 86 days

| style="text-align:left" | Henry IV

| 30 September 1399

| 20 March 1413

| style="text-align:right" | 4,919

| style="text-align:right" | 13 years, 171 days

| style="text-align:left" | William III

| 13 February 1689

| 8 March 1702

| style="text-align:right" | 4,770

| style="text-align:right" | 13 years, 23 days

| style="text-align:left" | Henry the Young King

| 14 June 1170

| 11 June 1183

| style="text-align:right" | 4,745

| style="text-align:right" | 12 years, 362 days

| style="text-align:left" | William II

| 26 September 1087

| 2 August 1100

| style="text-align:right" | 4,693

| style="text-align:right" | 12 years, 310 days

| style="text-align:left" | Richard I

| 6 July 1189

| 6 April 1199

| style="text-align:right" | 3,561

| style="text-align:right" | 9 years, 274 days

| style="text-align:left" | Eadred

| 26 May 946

| 23 November 955

| style="text-align:right" | 3,468

| style="text-align:right" | 9 years, 181 days

| style="text-align:left" | Henry V

| 21 March 1413

| 31 August 1422

| style="text-align:right" | 3,450

| style="text-align:right" | 9 years, 163 days

| style="text-align:left" | Edmund I

| 27 October 939

| 26 May 946

| style="text-align:right" | 2,403

| style="text-align:right" | 6 years, 211 days

| style="text-align:left" | Edward VI

| 28 January 1547

| 6 July 1553

| style="text-align:right" | 2,351

| style="text-align:right" | 6 years, 159 days

| style="text-align:left" | Mary II

| 13 February 1689

| 28 December 1694

| style="text-align:right" | 2,144

| style="text-align:right" | 5 years, 318 days

| style="text-align:left" | Mary I

| 19 July 1553

| 17 November 1558

| style="text-align:right" | 1,947

| style="text-align:right" | 5 years, 121 days

| style="text-align:left" | Anne

| 8 March 1702

| 30 April 1707

| style="text-align:right" | 1,879

| style="text-align:right" | 5 years, 53 days

| style="text-align:left" | Harold I

| 12 November 1035

| 17 March 1040

| style="text-align:right" | 1,586

| style="text-align:right" | 4 years, 126 days

| style="text-align:left" | Eadwig

| 23 November 955

| 1 October 959

| style="text-align:right" | 1,408

| style="text-align:right" | 3 years, 312 days

| style="text-align:left" | James II

| 6 February 1685

| 11 December 1688

| style="text-align:right" | 1,404

| style="text-align:right" | 3 years, 309 days

| style="text-align:left" | Edward the Martyr

| 9 July 975

| 18 March 978

| style="text-align:right" | 984

| style="text-align:right" | 2 years, 253 days

| style="text-align:left" | Harthacnut

| 17 March 1040

| 8 June 1042

| style="text-align:right" | 813

| style="text-align:right" | 2 years, 83 days

| style="text-align:left" | Richard III

| 26 June 1483

| 22 August 1485

| style="text-align:right" | 788

| style="text-align:right" | 2 years, 57 days

| style="text-align:left" | Harold II

| 5 January 1066

| 14 October 1066

| style="text-align:right" | 282

| style="text-align:right" | 282 days

| style="text-align:left" | Edmund II

| 23 April 1016

| 30 November 1016

| style="text-align:right" | 221

| style="text-align:right" | 221 days

| style="text-align:left" | Matilda

| 7 April 1141

| 1 November 1141

| style="text-align:right" | 208

| style="text-align:right" | 208 days

| style="text-align:left" | Edward V

| 9 April 1483

| 26 June 1483

| style="text-align:right" | 78

| style="text-align:right" | 78 days

| style="text-align:left" | Edgar II

| 15 October 1066

| 17 December 1066

| style="text-align:right" | 63

| style="text-align:right" | 63 days

| style="text-align:left" | Sweyn Forkbeard

| 25 December 1013

| 3 February 1014

| style="text-align:right" | 40

| style="text-align:right" | 40 days

| style="text-align:left" | Ælfweard

| 17 July 924

| 2 August 924

| style="text-align:right" | 16

| style="text-align:right" | 16 days

| style="text-align:left" | Jane

| 10 July 1553

| 19 July 1553

| style="text-align:right" | 9

| style="text-align:right" | 9 days

Scotland

Includes Scottish monarchs from the installation of Kenneth I (House of Alpin) in 848 to Anne (House of Stuart) and the Acts of Union on 1 May 1707, when the crown became part of the Kingdom of Great Britain.

{| class="wikitable sortable" style="text-align:center"

|- style="text-align:center"

! rowspan=2 | Name

! colspan=2 | Reign

! colspan=2 | Duration

! From

! To

! (days)

! (years, days)

| style="text-align:left" | James VI

| 24 July 1567

| 27 March 1625

| style="text-align:right" |

| style="text-align:left" | William I

| 9 December 1165

| 4 December 1214

| style="text-align:right" |

| style="text-align:left" | Constantine II

| 900

| 943

| style="text-align:right" | c. 15,500

| style="text-align:right" | c. 43 years

| style="text-align:left" | David II

| 7 June 1329

| 22 February 1371

| style="text-align:right" |

| style="text-align:left" | Alexander III

| 6 July 1249

| 19 March 1286

| style="text-align:right" |

| style="text-align:left" | Malcolm III

| 17 March 1058

| 13 November 1093

| style="text-align:right" |

| style="text-align:left" | Alexander II

| 4 December 1214

| 6 July 1249

| style="text-align:right" |

| style="text-align:left" | James I

| 4 April 1406

| 21 February 1437

| style="text-align:right" |

| style="text-align:left" | Malcolm II

| 25 March 1005

| 25 November 1034

| style="text-align:right" |

| style="text-align:left" | James V

| 9 September 1513

| 14 December 1542

| style="text-align:right" |

| style="text-align:left" | David I

| 23 April 1124

| 24 May 1153

| style="text-align:right" |

| style="text-align:left" | James III

| 3 August 1460

| 11 June 1488

| style="text-align:right" |

| style="text-align:left" | Charles II

| 30 January 1649 29 May 1660

| 3 September 1651 6 February 1685

| style="text-align:right" | Total: 9,965

| style="text-align:right" | Total: 27 years, 104 days

| style="text-align:left" | James IV

| 11 June 1488

| 9 September 1513

| style="text-align:right" |

| style="text-align:left" | Mary I

| 14 December 1542

| 24 July 1567

| style="text-align:right" |

| style="text-align:left" | Charles I

| 27 March 1625

| 30 January 1649

| style="text-align:right" |

| style="text-align:left" | Kenneth II

| 971

| 995

| style="text-align:right" | c. 8,700

| style="text-align:right" | c. 23–24 years

| style="text-align:left" | James II

| 21 February 1437

| 3 August 1460

| style="text-align:right" |

| style="text-align:left" | Edward Balliol (disputed)

| 24 September 1332

| 20 January 1356

| style="text-align:right" |

| style="text-align:left" | Robert I

| 25 March 1306

| 7 June 1329

| style="text-align:right" |

| style="text-align:left" | Robert II

| 22 February 1371

| 19 April 1390

| style="text-align:right" |

| style="text-align:left" | Alexander I

| 8 January 1107

| 23 April 1124

| style="text-align:right" |

| style="text-align:left" | Macbeth

| 14 August 1040

| 15 August 1057

| style="text-align:right" |

| style="text-align:left" | Robert III

| 19 April 1390

| 4 April 1406

| style="text-align:right" |

| style="text-align:left" | Constantine I

| 862

| 877

| style="text-align:right" | c. 5,400

| style="text-align:right" | c. 15 years

| style="text-align:left" | Kenneth MacAlpin

| 843

| 13 February 858

| style="text-align:right" | c. 5,100

| style="text-align:right" | c. 14 years

| style="text-align:left" | William II

| 11 May 1689

| 8 March 1702

| style="text-align:right" |

| style="text-align:left" | Malcolm IV

| 24 May 1153

| 9 December 1165

| style="text-align:right" |

| style="text-align:left" | Giric

| 878

| 889

| style="text-align:right" | c. 4.000

| style="text-align:right" | c. 11 years

| style="text-align:left" | Donald II

| 889

| 900

| style="text-align:right" | c. 4,000

| style="text-align:right" | c. 11 years

| style="text-align:left" | Malcolm I

| 943

| 954

| style="text-align:right" | c. 3,600

| style="text-align:right" | c. 10–11 years

| style="text-align:left" | Edgar

| 1097

| 8 January 1107

| style="text-align:right" | c. 3,600

| style="text-align:right" | c. 10 years

| style="text-align:left" | Kenneth III

| 997

| 25 March 1005

| style="text-align:right" | c. 2,900

| style="text-align:right" | c. 8 years

| style="text-align:left" | Indulf

| 954

| 962

| style="text-align:right" | c. 2,700

| style="text-align:right" | c. 8 years

| style="text-align:left" | Duncan I

| 25 November 1034

| 14 August 1040

| style="text-align:right" |

| style="text-align:left" | Mary II

| 11 April 1689

| 28 December 1694

| style="text-align:right" |

| style="text-align:left" | Amlaíb

| 971

| 977

| style="text-align:right" | c. 2,000

| style="text-align:right" | c. 5–6 years

| style="text-align:left" | Anne

| 8 March 1702

| 30 April 1707

| style="text-align:right" |

| style="text-align:left" | Dub

| 962

| c. 966-967

| style="text-align:right" | c. 1,800

| style="text-align:right" | c. 5 years

| style="text-align:left" | Cuilén

| c. 966-967

| 971

| style="text-align:right" | c. 1,800

| style="text-align:right" | c. 5 years

| style="text-align:left" | Domnall mac Ailpín

| 858

| 13 April 862

| style="text-align:right" | c. 1.300

| style="text-align:right" | c. 4 years

| style="text-align:left" | James VII

| 6 February 1685

| 11 December 1688

| style="text-align:right" |

| style="text-align:left" | Margaret

| 25 November 1286

| 26 September 1290

| style="text-align:right" |

| style="text-align:left" | John Balliol

| 17 November 1292

| 10 July 1296

| style="text-align:right" |

| style="text-align:left" | Donald III

| 13 November 1093

| 1097

| style="text-align:right" | c. 1,000

| style="text-align:right" | c. 3–4 years

| style="text-align:left" | Áed mac Cináeda

| 877

| 878

| style="text-align:right" | c. 365

| style="text-align:right" | c. 1 year

| style="text-align:left" | Constantine III

| 995

| 997

| style="text-align:right" | c. 485

| style="text-align:right" | 16 months

| style="text-align:left" | Lulach

| 15 August 1057

| 17 March 1058

| style="text-align:right" |

| style="text-align:left" | Duncan II

| May 1094

| 12 November 1094

| style="text-align:right" | c.

| style="text-align:right" | "less than 7 months"

List of the Principalities

Gwynedd (incomplete list)

The Principality (or Kingdom) of Gwynedd (5th century–1216), located in northwest Wales, was one of the most prominent early medieval Welsh kingdoms. Its rulers were often acclaimed as "King of the Britons," symbolizing their influence over other Welsh territories and their resistance to external threats. Gwynedd faced repeated challenges, including civil wars, Saxon incursions, and Norman invasions, which gradually eroded its dominance. In 1216, it transitioned into the Principality of Wales, although the title "Prince of Wales" was not formally adopted until the 1240s under the leadership of Llywelyn ap Gruffudd, also known as Llywelyn the Last.

Gwynedd’s heartland was the mountainous and hilly region of Snowdonia, which provided natural defenses and contributed to its resilience against invaders. The kingdom played a central role in preserving Welsh identity, language, and culture during a period of significant cultural and social upheaval in Britain.

Gwynedd’s political and military structure helped shape the foundations of later Welsh governance. Its rulers, particularly under the House of Aberffraw, established enduring principles of leadership and unity that influenced medieval Welsh law and identity. As historian R. R. Davies notes in The Age of Conquest: Wales 1063–1415, Gwynedd stood as “the nucleus of Welsh political life,” embodying both resistance and renewal amid centuries of external pressure.

{| class="wikitable sortable" style="text-align:center"

|- style="text-align:center"

! rowspan=2 | Name

! colspan=2 | Reign

! colspan=2 | Duration

! From

! To

! (days)

! (years, days)

| style="text-align:left" | Gruffudd ap Cynan

| 1081

| 1137

| style="text-align:right" |

| style="text-align:right" | 55–56 years

| style="text-align:left" | Llywelyn the Great

| 1195

| 11 April 1240

| style="text-align:right" | > 16,172

| style="text-align:right" | 44–45 years

| style="text-align:left" | Owain Gwynedd

| 1137

| 1170

| style="text-align:right" | > 11,688

| style="text-align:right" | 33 years

| style="text-align:left" | Dafydd ab Owain Gwynedd

| 1170

| 1195

| style="text-align:right" | > 8,766

| style="text-align:right" | 25 years

| style="text-align:left" |Cynan ab Iago

| 1023

| 1039

| style="text-align:right" | 5,840

| style="text-align:right" | 16 years

| style="text-align:left" | Hywel ab Owain Gwynedd

| 1170

| style="text-align:right" |

| style="text-align:right" | < 1 year

Wales

The Principality of Wales (1216–1542) was a client state of England for much of its history, except for brief periods when it was de facto independent under a Welsh Prince of Wales (see House of Aberffraw). From 1301 it was first used as a title of the English (and later British) heir apparent. The Laws in Wales Acts 1535 and 1542 formally incorporated all of Wales within the Kingdom of England.

{| class="wikitable sortable" style="text-align:center"

|- style="text-align:center"

! rowspan=2 | Name

! colspan=2 | Reign

! colspan=2 | Duration

! From

! To

! (days)

! (years, days)

| style="text-align: left;" |Llywelyn ab Iorwerth

|1195

|1240

| style="text-align: right;" |> 16436

| style="text-align: right;" | 45 years

| style="text-align: left;" |Dafydd ap Llywelyn

|1240

|1246

| style="text-align: right;" |> 2190

| style="text-align: right;" | 6 years

| style="text-align:left" | Llywelyn ap Gruffudd

| 1253

| 11 December 1282

| style="text-align:right" | > 10,572

| style="text-align:right" | 29 years

| style="text-align: left;" |Dafydd ap Gruffudd

|1282

|1283

| style="text-align: right;" |> 365

| style="text-align: right;" | 1 year

| style="text-align:left" | Owain Glyndŵr

| 16 September 1400

| 1416

| style="text-align:right" | > 5,585

| style="text-align:right" | 16 years

| style="text-align:left" | Owain Goch ap Gruffydd

| 25 February 1246

| 1255

| style="text-align:right" | > 3,000

| style="text-align:right" | 9 years

| style="text-align:left" | Owain Lawgoch

| May 1372

| July 1378

| style="text-align:right" | > 2,221

| style="text-align:right" | 6 years

| style="text-align:left" | Dafydd ap Llywelyn

| 12 April 1240

| 25 February 1246

| style="text-align:right" |

| style="text-align:left" | Dafydd ap Gruffydd

| 11 December 1282

| 3 October 1283

| style="text-align:right" |

| style="text-align:right" | days

List of monarchs in Britain by length of reign

Ten longest-reigning British monarchs

Complete list of the unitary monarchy

Complete list of the kingdoms

England

Scotland

List of the Principalities

Gwynedd (incomplete list)

Wales

See also

Notes

References