This is a list of British monarchs, that is, the monarchs on the thrones of some of the various kingdoms that have existed on, or incorporated, the island of Great Britain, namely:
In 1328, on the death of the French king, Charles IV, Edward III (nephew of Charles IV) claimed the French throne. British monarchs then styled themselves "King/Queen of France" until the Act of Union, which led to the creation of the United Kingdom in 1801. By then France had been a republic for ten years. See: English Kings of France
Note that the numbering of English monarchs starts afresh after 1066 (although this effects only the Edwards).
To see the rulers of the small kingdoms which existed before the formation of England, Scotland or Wales, see:
Royal titles are complicated because in some cases names of kingdoms are used that did not officially come into existence until later, or came into existence earlier without immediate adoption of the royal title.
For example, in October 1604, one year after James VI of Scotland had become King of England, he decreed that the Royal Title would use the term Great Brittaine to refer to the "one Imperiall Crowne" made up of England and Scotland. However using that title is problematic because the 'state' of Great Britain was not created until the Act of Union 1707. Nor was the united crown generally referred to as 'imperial'. Furthermore, monarchs continued to use ordinals attached to the two previous kingdoms, for instance James VII/II. To avoid confusion, historians in general thus refer to all monarchs up to 1707 as monarchs of England and Scotland (so explaining their two ordinals where they existed), with the monarch's title at all times accurately following the official name or names of the state or states they reigned over where it differed from the official royal title. (Hence though many English and British monarchs claimed France as part of their official title, that had no reality in substance, so it isn't used.) After the Union, the ordinal has either been the English number, or the greater of the two numbers - the results have been the same and there is no formal rule.
In different documents, the terms Kingdom of Great Britain and United Kingdom of Great Britain feature, even documents as official as the Act of Union 1707. Most historians presume the United was meant to be descriptive, indicating a union as a form of unity by marriage rather than coercion. For clarity and because the United is far more strongly associated with the later name United Kingdom of Great Britain and Ireland produced in the Act of Union 1800, the 1707 Kingdom is generally referred to as the Kingdom of Great Britain.
Similarly, though the Irish Free State ceased to be part of the United Kingdom of Great Britain and Ireland in 1922, neither the full name of the United Kingdom nor the royal title were changed until the Royal and Parliamentary Titles Act 1927. In this instance historians generally retrospectively date the coming into being of the modern United Kingdom to December 1922, even though in this case the formal change did not occur for another five years.
The list of monarchs below cannot be exhaustive. Succession to the many thrones often did not pass smoothly from parent to child; lack of heirs, civil wars, murders and invasions affected the inheritance in ways that a simple list does not show.
The relationships that formed the basis for claims to throne are noted where we know them, and the dates of reign indicated.
The Normans After the Norman Conquest in 1066, numbering of kings (a French tradition applied to the Saxons only by historians) begins anew, although this affects only the Edwards.
Monarchs of England and Ireland In 1199, John, already Lord of Ireland, inherited the English throne. The title "Lord of Ireland" was used until it was replaced by "King of Ireland" in 1542.
Monarchs of England, Scotland and Ireland In 1603, James VI of Scotland inherited the English throne upon the death of Elizabeth I. From then until 1707, England, Scotland and Ireland had shared monarchs.
The Period of Interregnum, (Commonwealth and Protectorate) There was no King between Charles I's execution in 1649 and the Restoration in 1660. The nation is ruled as a Republic until 1653, and when the parliament was dissolved in 1653, the nation is ruled by Lords Protector.
Monarchs of the United Kingdom of Great Britain and Northern Ireland In 1922, the Irish Free State left the United Kingdom. The name of the Kingdom was amended in 1927 to reflect the change.
A useful rhyme for memorising the names of the English and UK monarchs since the Norman Conquest in chronological order as well as a version was featured in part in the movie King Ralph: