In addition to English, literature has been written in a wide variety of other languages in Britain, that is the United Kingdom, the Isle of Man and the Channel Islands (the Isle of Man and the Bailiwicks of Guernsey and Jersey are not part of the United Kingdom, but are closely associated with it, being British Crown Dependencies). This includes literature in Scottish Gaelic, Welsh, Latin, Cornish, Anglo-Norman, Guernésiais, Jèrriais, Manx, and Irish (but the last of these only in Northern Ireland after 1922). Literature in Anglo-Saxon (Old English) is treated as English literature and literature in Scots as Scottish literature.

British identity The nature of British identity has changed over time. The island that contains England, Scotland, and Wales has been known as Britain from the time of the Roman Pliny the Elder (c. AD 23–79).Pliny the Elder's Naturalis Historia Book IV. Chapter XLI Latin text and English translation, numbered Book 4, Chapter 30, at the Perseus Project. Though the original inhabitants spoke mainly various Celtic languages, English as the national language had its beginnings with the Anglo-Saxon invasion of c.450 A.D.Jones & Casey 1988:367–98 "The Gallic Chronicle Restored: a Chronology for the Anglo-Saxon Invasions and the End of Roman Britain"

The various constituent parts of the present United Kingdom joined at different times. Wales was annexed by the Kingdom of England under the Acts of Union of 1536 and 1542, and it was not until 1707 with a treaty between England and Scotland, that the Kingdom of England became the Kingdom of Great Britain. This merged in 1801 with the Kingdom of Ireland to form the United Kingdom of Great Britain and Ireland. Until fairly recent times Celtic languages were spoken in Scotland, Wales, Cornwall, and Ireland, and still survive, especially in parts of Wales

Subsequently, the impact of British Unionism led to the partition of the island of Ireland in 1921, which means that literature of the Republic of Ireland is not British, although literature from Northern Ireland, is both Irish and British. More recently the relationship between England and Wales and Scotland, has changed, through the establishment of parliaments in both those countries, in addition to the British parliament in London.

Early Britain: 450 – 1100 A.D.

Latin literature, mostly ecclesiastical, continued to be written in the centuries following the withdrawal of the Roman Empire at the beginning of the fifth-century, including Chronicles by Bede (672/3–735), Historia ecclesiastica gentis Anglorum, and Gildas (c. 500–570), De Excidio et Conquestu Britanniae.

Various Celtic languages were spoken by many of British people at this time and among the most important written works that have survived are Y Gododdin i and the Mabinogion. Y Gododdin is a medieval Welsh poem consisting of a series of elegies to the men of the Britonnic kingdom of Gododdin and its allies who, according to the conventional interpretation, died fighting the Angles of Deira and Bernicia at a place named Catraeth in c. AD 600. It is traditionally ascribed to the bard Aneirin, and survives only in one manuscript, known as the Book of Aneirin.Jackson (1969)—the work is titled The Gododdin: the oldest Scottish poem. The name Mabinogion is a convenient label for a collection of eleven prose stories collated from two medieval Welsh manuscripts known as the White Book of Rhydderch (Llyfr Gwyn Rhydderch) (c. 1350) and the Red Book of Hergest (Llyfr Coch Hergest) (1382–1410). They are written in Middle Welsh, the common literary language between the end of the eleventh century and the fourteenth century. They include the four tales that form Pedair Cainc y Mabinogi ("The Four Branches of the Mabinogi"). The tales draw on pre-Christian Celtic mythology, international folktale motifs, and early medieval historical traditions.

From the 8th to the 15th centuries, Vikings and Norse settlers and their descendants colonised parts of what is now modern Scotland. Some Old Norse poetry survives relating to this period, including the Orkneyinga saga an historical narrative of the history of the Orkney Islands, from their capture by the Norwegian king in the ninth century onwards until about 1200.

Late medieval period: 1100–1500

Following the Norman Conquest in 1066, the Norman language became the language of England's nobility. During the whole of the 12th century the Anglo-Norman language (the variety of Norman used in England) shared with Latin the distinction of being the literary language of England, and it was in use at the court until the 14th century. It was not until the reign of Henry VII that English became the native tongue of the kings of England.

Works were still written in Latin and include Gerald of Wales's late-12th-century book on his beloved Wales, Itinerarium Cambriae, and following the Norman Conquest of 1066, Anglo-Norman literature developed in the Anglo-Norman realm introducing literary trends from Continental Europe, such as the chanson de geste. However, the indigenous development of Anglo-Norman literature was precocious in comparison to continental Oïl literature.Language and Literature, Ian Short, in A Companion to the Anglo-Norman World, edited Christopher Harper-Bill and Elisabeth van Houts, Woodbridge 2003,

Geoffrey of Monmouth was one of the major figures in the development of British history and the popularity for the tales of King Arthur. He is best known for his chronicle Historia Regum Britanniae (History of the Kings of Britain) of 1136, which spread Celtic motifs to a wider audience. Wace (c. 1110 – after 1174), who wrote in Norman-French, is the earliest known poet from Jersey, also developed the Arthurian legend.Burgess, ed., xiii;) At the end of the 12th century, Layamon in Brut adapted Wace to make the first English language work to use the legends of King Arthur and the Knights of the Round Table.

Early English Jewish literature developed after the Norman Conquest with Jewish settlement in England. Berechiah ha-Nakdan is known chiefly as the author of a 13th-century set of over a hundred fables, called Mishle Shualim, (Fox Fables). The development of Jewish literature in medieval England ended with the Edict of Expulsion of 1290.

The multilingual nature of the audience for literature in the 14th century can be illustrated by the example of John Gower (c. 1330 – October 1408). A contemporary of William Langland and a personal friend of Geoffrey Chaucer, Gower is remembered primarily for three major works, the Mirroir de l'Omme, Vox Clamantis, and Confessio Amantis, three long poems written in Anglo-Norman, Latin, and Middle English respectively, which are united by common moral and political themes.

Dafydd ap Gwilym (c. 1315/1320 – c. 1350/1370), is widely regarded as the leading Welsh poet and amongst the great poets of Europe in the Middle Ages. His main themes are love and nature. The influence of the ideas of courtly love, found in the troubadour poetry of Provençal, was a significant influence on his poetry.Rachel Bromwich, Aspects of the Poetry of Dafydd ap Gwilym (Cardiff, University of Wales Press, 1986).

Major Scottish writers from the 15th century include Henrysoun, Dunbar, Douglas and Lyndsay, who wrote in Middle Scots, often simply called English, the dominant language of Scotland.

In the Cornish language, Passhyon agan Arloedh ("The Passion of our Lord"), a poem of 259 eight-line verses written in 1375, is one of the earliest surviving works of Cornish literature. The most important work of literature surviving from the Middle Cornish period is An Ordinale Kernewek ("The Cornish Ordinalia"), a 9000-line religious drama composed around the year 1400. Three plays in Cornish known as the Ordinalia have survived from this period.A Handbook of the Cornish Language, by Henry Jenner A Project Gutenberg eBook;A brief history of the Cornish language .

The Renaissance: 1500–1660

The spread of printing affected the transmission of literature across Britain and Ireland. The first book printed in English, William Caxton's own translation of Recuyell of the Historyes of Troye, was printed abroad in 1473, to be followed by the establishment of the first printing press in England in 1474. The establishment of a printing press in Scotland under royal patent from James IV in 1507 made it easier to disseminate Scottish literature.P. J. Bawcutt and J. H. Williams, A Companion to Medieval Scottish Poetry (Woodbridge: Brewer, 2006), , pp. 26–9. The first printing press in Ireland followed later in 1551. Although the first book in Welsh to be printed was produced by John Prise in 1546, restrictions on printing meant that only clandestine presses, such as that of Robert Gwyn who published Y Drych Cristionogawl in 1586/1587, could operate in Wales until 1695. The first legal printing press to be set up in Wales was in 1718 by Isaac Carter. The first printed work in Manx dates from 1707: a translation of a Prayer Book catechism in English by Bishop Thomas Wilson. Printing arrived even later in other parts of Britain and Ireland: the first printing press in Jersey was set up by Mathieu Alexandre in 1784. The earliest datable text in Manx (preserved in 18th-century manuscripts), a poetic history of the Isle of Man from the introduction of Christianity, dates to the 16th century at the latest.

The reign of Queen Elizabeth I of England (1558–1603) and of King James I (1603–162) (James VI of Scotland), saw the development of Britishness in literature. In anticipation of James VI's expected inheritance of the English throne, court masques in England were already developing the new literary imagery of a united "Great Britain", sometimes delving into Roman and Celtic sources. William Camden's Britannia, a county by county description of Great Britain and Ireland, was an influential work of chorography: a study relating landscape, geography, antiquarianism, and history. Britannia came to be viewed as the personification of Britain, in imagery that developed during the reign of Queen Elizabeth I.

The Renaissance in Wales was marked by humanism and scholarship. The Welsh language, its grammar and lexicography, was studied for the first time and biblical studies flourished. Welsh writers such as John Owen and William Vaughan wrote in Latin or English to communicate their ideas outside Wales, but the humanists were unsuccessful in opening the established practices of professional Welsh poets to Renaissance influences. From the Reformation until the 19th century most literature in the Welsh language was religious in character. Morgan Llwyd's Llyfr y Tri Aderyn ("The Book of the Three Birds") (1653) took the form of a dialogue between an eagle (representing secular authority, particularly Cromwell); a dove (representing the Puritans); and a raven (representing the Anglican establishment).

The Reformation and vernacular literature At the Reformation, the translation of liturgy and Bible into vernacular languages provided new literary models. The Book of Common Prayer and the Authorized King James Version of the Bible have been hugely influential. The King James Bible, one of the biggest translation projects in the history of English up to this time, was started in 1604 and completed in 1611.

The earliest surviving examples of Cornish prose are Pregothow Treger (The Tregear Homilies), a set of 66 sermons translated from English by John Tregear 1555–1557.

In 1567 William Salesbury's Welsh translations of the New Testament and Book of Common prayer were published. William Morgan's translation of the whole Bible followed in 1588 and remained the standard Welsh Bible until well into the 20th century.