List of longest reigning Monarchs of the UK

The following is a list, ordered by length of reign, of the monarchs of the United Kingdom of Great Britain and Ireland (Northern Ireland after 1927), the Kingdom of Great Britain

Kingdom of Great Britain

The former Kingdom of Great Britain, sometimes described as the 'United Kingdom of Great Britain', That the Two Kingdoms of Scotland and England, shall upon the 1st May next ensuing the date hereof, and forever after, be United into One Kingdom by the Name of GREAT BRITAIN. was a sovereign...

, the Kingdom of England

Kingdom of England

The Kingdom of England was, from 927 to 1707, a sovereign state to the northwest of continental Europe. At its height, the Kingdom of England spanned the southern two-thirds of the island of Great Britain and several smaller outlying islands; what today comprises the legal jurisdiction of England...

since 925 AD, the Kingdom of Scotland

Kingdom of Scotland

The Kingdom of Scotland was a Sovereign state in North-West Europe that existed from 843 until 1707. It occupied the northern third of the island of Great Britain and shared a land border to the south with the Kingdom of England...

since 1107 AD and the Principality of Wales

Principality of Wales

The Principality of Wales existed between 1216 and 1542, encompassing two-thirds of modern Wales.It was formally founded in 1216 at the Council of Aberdyfi, and later recognised by the 1218 Treaty of Worcester between Llywelyn the Great of Wales and Henry III of England...

from 1170 AD.

Overall

Name	\| Reign		\| Duration
Name	from	to	days	years/days
Victoria	20 June 1837	22 January 1901
*Elizabeth II*	*6 February 1952*	*present*
George III George III of the United Kingdom George III was King of Great Britain and King of Ireland from 25 October 1760 until the union of these two countries on 1 January 1801, after which he was King of the United Kingdom of Great Britain and Ireland until his death...	25 October 1760	29 January 1820
James VI of Scotland James I of England James VI and I was King of Scots as James VI from 24 July 1567 and King of England and Ireland as James I from the union of the English and Scottish crowns on 24 March 1603...	24 July 1567	27 March 1625
Henry III of England Henry III of England Henry III was the son and successor of John as King of England, reigning for 56 years from 1216 until his death. His contemporaries knew him as Henry of Winchester. He was the first child king in England since the reign of Æthelred the Unready...	18 October 1216	16 November 1272
Edward III of England Edward III of England Edward III was King of England from 1327 until his death and is noted for his military success. Restoring royal authority after the disastrous reign of his father, Edward II, Edward III went on to transform the Kingdom of England into one of the most formidable military powers in Europe...	25 January 1327	21 June 1377
William I of Scotland	9 December 1165	4 December 1214
Llywelyn of Gwynedd	1195	11 April 1240	unknown	c. 45 years
Elizabeth I of England Elizabeth I of England Elizabeth I was queen regnant of England and Ireland from 17 November 1558 until her death. Sometimes called The Virgin Queen, Gloriana, or Good Queen Bess, Elizabeth was the fifth and last monarch of the Tudor dynasty...	17 November 1558	24 March 1603
David II of Scotland David II of Scotland David II was King of Scots from 7 June 1329 until his death.-Early life:...	7 June 1329	22 February 1371

United Kingdom

On 1 January 1801 the Kingdom of Great Britain

Kingdom of Great Britain

united with the Kingdom of Ireland

Kingdom of Ireland

The Kingdom of Ireland refers to the country of Ireland in the period between the proclamation of Henry VIII as King of Ireland by the Crown of Ireland Act 1542 and the Act of Union in 1800. It replaced the Lordship of Ireland, which had been created in 1171...

to become the United Kingdom of Great Britain and Ireland

United Kingdom of Great Britain and Ireland

The United Kingdom of Great Britain and Ireland was the formal name of the United Kingdom during the period when what is now the Republic of Ireland formed a part of it....

, later becoming the United Kingdom of Great Britain and Northern Ireland

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

following the partial independence of Ireland

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

Name	\| Reign		\| Duration
Name	from	to	days	years/days
Victoria	20 June 1837	22 January 1901
*Elizabeth II*	*6 February 1952*	*present*
George III George III of the United Kingdom George III was King of Great Britain and King of Ireland from 25 October 1760 until the union of these two countries on 1 January 1801, after which he was King of the United Kingdom of Great Britain and Ireland until his death...	25 October 1760	29 January 1820
George V George V of the United Kingdom George V was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 through the First World War until his death in 1936....	6 May 1910	20 January 1936
George VI George VI of the United Kingdom George VI was King of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until his death...	11 December 1936	6 February 1952
George IV George IV of the United Kingdom George IV was the King of the United Kingdom of Great Britain and Ireland and also of Hanover from the death of his father, George III, on 29 January 1820 until his own death ten years later...	29 January 1820	26 June 1830
Edward VII Edward VII of the United Kingdom Edward VII was King of the United Kingdom and the British Dominions and Emperor of India from 22 January 1901 until his death in 1910...	22 January 1901	6 May 1910
William IV William IV of the United Kingdom William IV was King of the United Kingdom of Great Britain and Ireland and of Hanover from 26 June 1830 until his death...	26 June 1830	20 June 1837
Edward VIII Edward VIII of the United Kingdom Edward VIII was King of the United Kingdom and the Dominions of the British Commonwealth, and Emperor of India, from 20 January to 11 December 1936.Before his accession to the throne, Edward was Prince of Wales and Duke of Cornwall and Rothesay...	20 January 1936	11 December 1936		days

Great Britain

On 1 May 1707, under the Acts of Union 1707

Acts of Union 1707

The Acts of Union were two Parliamentary Acts - the Union with Scotland Act passed in 1706 by the Parliament of England, and the Union with England Act passed in 1707 by the Parliament of Scotland - which put into effect the terms of the Treaty of Union that had been agreed on 22 July 1706,...

, the Kingdom of England

Kingdom of England

united with the Kingdom of Scotland

Kingdom of Scotland

as the Kingdom of Great Britain

Kingdom of Great Britain

Name	\| Reign		\| Duration
Name	from	to	days	years/days
George III George III of the United Kingdom George III was King of Great Britain and King of Ireland from 25 October 1760 until the union of these two countries on 1 January 1801, after which he was King of the United Kingdom of Great Britain and Ireland until his death...	25 October 1760	29 January 1820
George II George II of Great Britain George II was King of Great Britain and Ireland, Duke of Brunswick-Lüneburg and Archtreasurer and Prince-elector of the Holy Roman Empire from 11 June 1727 until his death.George was the last British monarch born outside Great Britain. He was born and brought up in Northern Germany...	11 June 1727	25 October 1760
George I George I of Great Britain George I was King of Great Britain and Ireland from 1 August 1714 until his death, and ruler of the Duchy and Electorate of Brunswick-Lüneburg in the Holy Roman Empire from 1698....	1 August 1714	11 June 1727
Anne	8 March 1702	1 August 1714

England

The longest claimed reign

Pretender

A pretender is one who claims entitlement to an unavailable position of honour or rank. Most often it refers to a former monarch, or descendant thereof, whose throne is occupied or claimed by a rival, or has been abolished....

was that of James Francis Edward Stuart

James Francis Edward Stuart

James Francis Edward, Prince of Wales was the son of the deposed James II of England...

(the "Old Pretender"), whose pretence lasted 64 years, 3 months and 16 days as the Jacobite pretender to the thrones of England, Scotland and Ireland (17 September 1701 – 1 January 1766).

Name	\| Reign		\| Duration
Name	from	to	days	years/days
Henry III Henry III of England Henry III was the son and successor of John as King of England, reigning for 56 years from 1216 until his death. His contemporaries knew him as Henry of Winchester. He was the first child king in England since the reign of Æthelred the Unready...	18 or 19 October 1216	16 November 1272	or	or 29 days
Edward III Edward III of England Edward III was King of England from 1327 until his death and is noted for his military success. Restoring royal authority after the disastrous reign of his father, Edward II, Edward III went on to transform the Kingdom of England into one of the most formidable military powers in Europe...	25 January 1327	21 June 1377
Elizabeth I Elizabeth I of England Elizabeth I was queen regnant of England and Ireland from 17 November 1558 until her death. Sometimes called The Virgin Queen, Gloriana, or Good Queen Bess, Elizabeth was the fifth and last monarch of the Tudor dynasty...	17 November 1558	24 March 1603
Henry VI Henry VI of England Henry VI was King of England from 1422 to 1461 and again from 1470 to 1471, and disputed King of France from 1422 to 1453. Until 1437, his realm was governed by regents. Contemporaneous accounts described him as peaceful and pious, not suited for the violent dynastic civil wars, known as the Wars...	31 August 1422	4 March 1461
	31 October 1470	11 April 1471		days
Æthelred II	18 March 978	25 December 1013
Æthelred II	3 February 1014	23 April 1016
Henry VIII Henry VIII of England Henry VIII was King of England from 21 April 1509 until his death. He was Lord, and later King, of Ireland, as well as continuing the nominal claim by the English monarchs to the Kingdom of France...	22 April 1509	28 January 1547
Henry I Henry I of England Henry I was the fourth son of William I of England. He succeeded his elder brother William II as King of England in 1100 and defeated his eldest brother, Robert Curthose, to become Duke of Normandy in 1106...	3 August 1100	1 December 1135
Henry II Henry II of England Henry II ruled as King of England , Count of Anjou, Count of Maine, Duke of Normandy, Duke of Aquitaine, Duke of Gascony, Count of Nantes, Lord of Ireland and, at various times, controlled parts of Wales, Scotland and western France. Henry, the great-grandson of William the Conqueror, was the... (co-ruler with Henry the Young King)	25 October 1154	6 July 1189
Edward I Edward I of England Edward I , also known as Edward Longshanks and the Hammer of the Scots, was King of England from 1272 to 1307. The first son of Henry III, Edward was involved early in the political intrigues of his father's reign, which included an outright rebellion by the English barons...	20 November 1272	7 July 1307
Alfred Alfred the Great Alfred the Great was King of Wessex from 871 to 899.Alfred is noted for his defence of the Anglo-Saxon kingdoms of southern England against the Vikings, becoming the only English monarch still to be accorded the epithet "the Great". Alfred was the first King of the West Saxons to style himself...	24 April 871	26 October 899
Edward the Elder Edward the Elder Edward the Elder was an English king. He became king in 899 upon the death of his father, Alfred the Great. His court was at Winchester, previously the capital of Wessex...	27 October 899	17 July 924
Charles II Charles II of England Charles II was monarch of the three kingdoms of England, Scotland, and Ireland.Charles II's father, King Charles I, was executed at Whitehall on 30 January 1649, at the climax of the English Civil War...	29 May 1660	6 February 1685
Charles I Charles I of England Charles I was King of England, King of Scotland, and King of Ireland from 27 March 1625 until his execution in 1649. Charles engaged in a struggle for power with the Parliament of England, attempting to obtain royal revenue whilst Parliament sought to curb his Royal prerogative which Charles...	27 March 1625	30 January 1649
Henry VII Henry VII of England Henry VII was King of England and Lord of Ireland from his seizing the crown on 22 August 1485 until his death on 21 April 1509, as the first monarch of the House of Tudor....	22 August 1485	21 April 1509
Edward the Confessor Edward the Confessor Edward the Confessor also known as St. Edward the Confessor , son of Æthelred the Unready and Emma of Normandy, was one of the last Anglo-Saxon kings of England and is usually regarded as the last king of the House of Wessex, ruling from 1042 to 1066....	8 June 1042	5 January 1066
Richard II Richard II of England Richard II was King of England, a member of the House of Plantagenet and the last of its main-line kings. He ruled from 1377 until he was deposed in 1399. Richard was a son of Edward, the Black Prince, and was born during the reign of his grandfather, Edward III...	22 June 1377	29 September 1399
James I James I of England James VI and I was King of Scots as James VI from 24 July 1567 and King of England and Ireland as James I from the union of the English and Scottish crowns on 24 March 1603...	24 March 1603	27 March 1625
Edward IV Edward IV of England Edward IV was King of England from 4 March 1461 until 3 October 1470, and again from 11 April 1471 until his death. He was the first Yorkist King of England...	4 March 1461	3 October 1470
	11 April 1471	9 April 1483
William I	12 December 1066	9 September 1087
Edward II Edward II of England Edward II , called Edward of Caernarfon, was King of England from 1307 until he was deposed by his wife Isabella in January 1327. He was the sixth Plantagenet king, in a line that began with the reign of Henry II...	7 July 1307	20 January 1327
Cnut	30 November 1016	12 November 1035
Stephen Stephen, King of England Stephen , often referred to as Stephen of Blois , was a grandson of William the Conqueror. He was King of England from 1135 to his death, and also the Count of Boulogne by right of his wife. Stephen's reign was marked by the Anarchy, a civil war with his cousin and rival, the Empress Matilda...	22 December 1135	7 April 1141
	1 November 1141	25 October 1154
John	6 April 1199	19 October 1216
Edgar I	1 October 959	8 July 975
Æthelstan	2 August 924 (or 925)	27 October 939	or	or
Henry IV Henry IV of England Henry IV was King of England and Lord of Ireland . He was the ninth King of England of the House of Plantagenet and also asserted his grandfather's claim to the title King of France. He was born at Bolingbroke Castle in Lincolnshire, hence his other name, Henry Bolingbroke...	29 September 1399	20 March 1413
William III William III of England William III & II was a sovereign Prince of Orange of the House of Orange-Nassau by birth. From 1672 he governed as Stadtholder William III of Orange over Holland, Zeeland, Utrecht, Guelders, and Overijssel of the Dutch Republic. From 1689 he reigned as William III over England and Ireland... (co-ruler with Mary II)	13 February 1689	8 March 1702
Henry the Young King Henry the Young King Henry, known as the Young King was the second of five sons of King Henry II of England and Eleanor of Aquitaine but the first to survive infancy. He was officially King of England; Duke of Normandy, Count of Anjou and Maine.-Early life:Little is known of the young prince Henry before the events... (co-ruler with Henry II)	14 June 1170	11 June 1183
William II William II of England William II , the third son of William I of England, was King of England from 1087 until 1100, with powers over Normandy, and influence in Scotland. He was less successful in extending control into Wales...	9 September 1087	2 August 1100
Anne	8 March 1702	1 August 1714
Richard I Richard I of England Richard I was King of England from 6 July 1189 until his death. He also ruled as Duke of Normandy, Duke of Aquitaine, Duke of Gascony, Lord of Cyprus, Count of Anjou, Count of Maine, Count of Nantes, and Overlord of Brittany at various times during the same period...	6 July 1189	6 April 1199
Eadred	26 May 946	23 November 955
Henry V Henry V of England Henry V was King of England from 1413 until his death at the age of 35 in 1422. He was the second monarch belonging to the House of Lancaster....	21 March 1413	31 August 1422
Edmund I	27 October 939	26 May 946
Edward VI Edward VI of England Edward VI was the King of England and Ireland from 28 January 1547 until his death. He was crowned on 20 February at the age of nine. The son of Henry VIII and Jane Seymour, Edward was the third monarch of the Tudor dynasty and England's first monarch who was raised as a Protestant...	28 January 1547	6 July 1553
Mary II Mary II of England Mary II was joint Sovereign of England, Scotland, and Ireland with her husband and first cousin, William III and II, from 1689 until her death. William and Mary, both Protestants, became king and queen regnant, respectively, following the Glorious Revolution, which resulted in the deposition of... (co-ruler with William III)	13 February 1689	28 December 1694
Mary I Mary I of England Mary I was queen regnant of England and Ireland from July 1553 until her death.She was the only surviving child born of the ill-fated marriage of Henry VIII and his first wife Catherine of Aragon. Her younger half-brother, Edward VI, succeeded Henry in 1547... (co-ruler with Philip)	19 July 1553	17 November 1558
Philip Philip II of Spain Philip II was King of Spain, Portugal, Naples, Sicily, and, while married to Mary I, King of England and Ireland. He was lord of the Seventeen Provinces from 1556 until 1581, holding various titles for the individual territories such as duke or count.... (co-ruler with Mary I)	25 July 1554	17 November 1558
James II James II of England James II & VII was King of England and King of Ireland as James II and King of Scotland as James VII, from 6 February 1685. He was the last Catholic monarch to reign over the Kingdoms of England, Scotland, and Ireland...	6 February 1685	11 December 1688
Eadwig	23 November 955	1 October 959
Edward the Martyr Edward the Martyr Edward the Martyr was king of the English from 975 until he was murdered in 978. Edward was the eldest son of King Edgar, but not his father's acknowledged heir...	9 July 975	18 March 978
Harold I Harold Harefoot Harold Harefoot was King of England from 1037 to 1040. His cognomen "Harefoot" referred to his speed, and the skill of his huntsmanship. He was the son of Cnut the Great, king of England, Denmark, and Norway by Ælfgifu of Northampton...	12 November 1037	17 March 1040
Harthacnut	17 March 1040	8 June 1042
Richard III Richard III of England Richard III was King of England for two years, from 1483 until his death in 1485 during the Battle of Bosworth Field. He was the last king of the House of York and the last of the Plantagenet dynasty...	26 June 1483	22 August 1485
Louis Louis VIII of France Louis VIII the Lion reigned as King of France from 1223 to 1226. He was a member of the House of Capet. Louis VIII was born in Paris, France, the son of Philip II Augustus and Isabelle of Hainaut. He was also Count of Artois, inheriting the county from his mother, from 1190–1226... (disputed)	14 June 1216	22 September 1217
Harold II Harold Godwinson Harold Godwinson was the last Anglo-Saxon King of England.It could be argued that Edgar the Atheling, who was proclaimed as king by the witan but never crowned, was really the last Anglo-Saxon king...	5 January 1066	14 October 1066		days
Edmund II Edmund Ironside Edmund Ironside or Edmund II was king of England from 23 April to 30 November 1016. His cognomen "Ironside" is not recorded until 1057, but may have been contemporary. According to the Anglo-Saxon Chronicle, it was given to him "because of his valour" in resisting the Danish invasion led by Cnut...	23 April 1016	30 November 1016		days
Matilda Empress Matilda Empress Matilda , also known as Matilda of England or Maude, was the daughter and heir of King Henry I of England. Matilda and her younger brother, William Adelin, were the only legitimate children of King Henry to survive to adulthood... (disputed)	7 April 1141	1 November 1141		days
Edward V Edward V of England Edward V was King of England from 9 April 1483 until his deposition two months later. His reign was dominated by the influence of his uncle Richard, Duke of Gloucester, who succeeded him as Richard III...	9 April 1483	26 June 1483		days
Edgar II	15 October 1066	17 December 1066		days
Sweyn Forkbeard	25 December 1013	3 February 1014		days
Jane Lady Jane Grey Lady Jane Grey , also known as The Nine Days' Queen, was an English noblewoman who was de facto monarch of England from 10 July until 19 July 1553 and was subsequently executed... (disputed)	10 July 1553	19 July 1553		days

Scotland

The longest claimed reign

Pretender

was that of James Francis Edward Stuart

James Francis Edward Stuart

James Francis Edward, Prince of Wales was the son of the deposed James II of England...

(the "Old Pretender"), whose pretence lasted 64 years, 3 months and 16 days as the Jacobite pretender to the thrones of England, Scotland and Ireland (17 September 1701 – 1 January 1766).

Name	\| Reign		\| Duration
Name	from	to	days	years/days
James VI James I of England James VI and I was King of Scots as James VI from 24 July 1567 and King of England and Ireland as James I from the union of the English and Scottish crowns on 24 March 1603...	24 July 1567	27 March 1625
William I	9 December 1165	4 December 1214
David II David II of Scotland David II was King of Scots from 7 June 1329 until his death.-Early life:...	7 June 1329	22 February 1371
Alexander III Alexander III of Scotland Alexander III was King of Scots from 1249 to his death.-Life:...	6 July 1249	19 March 1286
Malcolm III Malcolm III of Scotland Máel Coluim mac Donnchada , was King of Scots...	17 March 1058	13 November 1093
Alexander II Alexander II of Scotland Alexander II was King of Scots from1214 to his death.-Early life:...	4 December 1214	6 July 1249
James I James I of Scotland James I, King of Scots , was the son of Robert III and Annabella Drummond. He was probably born in late July 1394 in Dunfermline as youngest of three sons...	4 April 1406	21 February 1437
James V James V of Scotland James V was King of Scots from 9 September 1513 until his death, which followed the Scottish defeat at the Battle of Solway Moss...	9 September 1513	14 December 1542
David I David I of Scotland David I or Dabíd mac Maíl Choluim was a 12th-century ruler who was Prince of the Cumbrians and later King of the Scots...	23 April 1124	24 May 1153
James III James III of Scotland James III was King of Scots from 1460 to 1488. James was an unpopular and ineffective monarch owing to an unwillingness to administer justice fairly, a policy of pursuing alliance with the Kingdom of England, and a disastrous relationship with nearly all his extended family.His reputation as the...	3 August 1460	11 June 1488
Charles II Charles II of England Charles II was monarch of the three kingdoms of England, Scotland, and Ireland.Charles II's father, King Charles I, was executed at Whitehall on 30 January 1649, at the climax of the English Civil War...	30 January 1649	3 September 1651
	29 May 1660	6 February 1685
James IV James IV of Scotland James IV was King of Scots from 11 June 1488 to his death. He is generally regarded as the most successful of the Stewart monarchs of Scotland, but his reign ended with the disastrous defeat at the Battle of Flodden Field, where he became the last monarch from not only Scotland, but also from all...	11 June 1488	9 September 1513
Mary I	14 December 1542	24 July 1567
Charles I Charles I of England Charles I was King of England, King of Scotland, and King of Ireland from 27 March 1625 until his execution in 1649. Charles engaged in a struggle for power with the Parliament of England, attempting to obtain royal revenue whilst Parliament sought to curb his Royal prerogative which Charles...	27 March 1625	30 January 1649
James II James II of Scotland James II reigned as King of Scots from 1437 to his death.He was the son of James I, King of Scots, and Joan Beaufort...	21 February 1437	3 August 1460
Robert I	25 March 1306	7 June 1329
Robert II Robert II of Scotland Robert II became King of Scots in 1371 as the first monarch of the House of Stewart. He was the son of Walter Stewart, hereditary High Steward of Scotland and of Marjorie Bruce, daughter of Robert I and of his first wife Isabella of Mar...	22 February 1371	19 April 1390
Alexander I Alexander I of Scotland Alexander I , also called Alaxandair mac Maíl Coluim and nicknamed "The Fierce", was King of the Scots from 1107 to his death.-Life:...	8 January 1107	23 April 1124
Robert III Robert III of Scotland Robert III was King of Scots from 1390 to his death. His given name was John Stewart, and he was known primarily as the Earl of Carrick before ascending the throne at age 53...	19 April 1390	4 April 1406
William II William III of England William III & II was a sovereign Prince of Orange of the House of Orange-Nassau by birth. From 1672 he governed as Stadtholder William III of Orange over Holland, Zeeland, Utrecht, Guelders, and Overijssel of the Dutch Republic. From 1689 he reigned as William III over England and Ireland...	11 May 1689	8 March 1702
Anne	8 March 1702	1 August 1714
Malcolm IV Malcolm IV of Scotland Malcolm IV , nicknamed Virgo, "the Maiden" , King of Scots, was the eldest son of Earl Henry and Ada de Warenne...	24 May 1153	9 December 1165
Mary II Mary II of England Mary II was joint Sovereign of England, Scotland, and Ireland with her husband and first cousin, William III and II, from 1689 until her death. William and Mary, both Protestants, became king and queen regnant, respectively, following the Glorious Revolution, which resulted in the deposition of...	11 May 1689	28 December 1694
James VII James II of England James II & VII was King of England and King of Ireland as James II and King of Scotland as James VII, from 6 February 1685. He was the last Catholic monarch to reign over the Kingdoms of England, Scotland, and Ireland...	6 February 1685	11 December 1688 claimed until 16 September 1701	claimed	claimed
John Balliol	17 November 1292	10 July 1296

Wales

Name	\| Reign		\| Duration
Name	from	to	days	years/days
Llywelyn I	1195	11 April 1240	unknown	c. 45 years
Owain I Owain Gwynedd Owain Gwynedd ap Gruffydd , in English also known as Owen the Great, was King of Gwynedd from 1137 until his death in 1170. He is occasionally referred to as "Owain I of Gwynedd"; and as "Owain I of Wales" on account of his claim to be King of Wales. He is considered to be the most successful of...	1137	1170	unknown	c. 33 years
Llywelyn II	1253	11 December 1282	unknown	c. 29 years
Dafydd I Dafydd ab Owain Gwynedd Dafydd ab Owain Gwynedd was Prince of Gwynedd from 1170 to 1195. For a time he ruled jointly with his brothers Maelgwn ab Owain Gwynedd and Rhodri ab Owain Gwynedd....	1170	1195	unknown	c. 25 years
Owain IV Owain Glyndwr Owain Glyndŵr , or Owain Glyn Dŵr, anglicised by William Shakespeare as Owen Glendower , was a Welsh ruler and the last native Welshman to hold the title Prince of Wales... (disputed)	16 September 1400	c. 1416	unknown	c. 16 years
Owain II Owain Goch ap Gruffydd Owain ap Gruffudd, , , was brother to Llywelyn the Last and Dafydd ap Gruffudd and, for a brief period in the late 1240s and early 1250s, ruler of part of the Kingdom of Gwynedd .- Lineage :Owain was the eldest son of Gruffudd ap Llywelyn and the grandson of Llywelyn the Great...	26 February 1246	1253	unknown	c. 7 years
Owain III Owain Lawgoch Owain Lawgoch, , full name Owain ap Thomas ap Rhodri , was a Welsh soldier who served in Spain, France, Alsace and Switzerland. He led a Free Company fighting for the French against the English in the Hundred Years' War... (disputed)	May 1372	July 1378	unknown	c. 6 years
Dafydd II Dafydd ap Llywelyn Dafydd ap Llywelyn was Prince of Gwynedd from 1240 to 1246. He was for a time recognised as Prince of Wales.- Descent :...	12 April 1240	25 February 1246
Dafydd III Dafydd ap Gruffydd Dafydd ap Gruffydd was Prince of Wales from 11 December 1282 until his execution on 3 October 1283 by King Edward I of England...	12 December 1282	3 October 1283		days

The current monarch

Should Elizabeth II still be reigning on—

10 September 2015, at the age of 89, she would surpass Queen Victoria as the longest-reigning monarch in British and Commonwealth history (as well as the longest-reigning female monarch in world history).
26 May 2024, she would surpass Louis XIV of France
Louis XIV of France
Louis XIV , known as Louis the Great or the Sun King , was a Bourbon monarch who ruled as King of France and Navarre. His reign, from 1643 to his death in 1715, began at the age of four and lasted seventy-two years, three months, and eighteen days...

as the longest reigning monarch in European history. At that point she would be old.
18 October 2034, at the age of 108, she would surpass Sobhuza II of Swaziland
Swaziland
Swaziland, officially the Kingdom of Swaziland , and sometimes called Ngwane or Swatini, is a landlocked country in Southern Africa, bordered to the north, south and west by South Africa, and to the east by Mozambique...

as the longest documented reigning monarch (male or female) in world history, unless the reign of King Bhumibol Adulyadej (King Rama IX) of Thailand
Thailand
Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...

surpasses 82 years, 254 days on 18 February 2029, at the age of 101. He ascended the Thai throne 5 years and 242 days before she ascended the British throne, and is one year and 228 days her junior.

Overall

United Kingdom

Great Britain

England

Scotland

Wales

The current monarch

See also