Geoffrey of Monmouth
Geoffrey of Monmouth (Galfridus Monemutensis, Galfridus Arturus; Gruffudd ap Arthur, Sieffre o Fynwy; c. 1095) was a Christian cleric from Monmouth, Wales, and one of the major figures in the popularity of tales of King Arthur. He is best known for his chronicle The History of the Kings of Britain (De gestis Britonum or Historia Regum Britanniae) which was widely popular in its day, being translated into other languages from its original Latin.
Also recorded as Geoffrey of Monmouth, Bishop of St. Asaph · Geoffrey Monmouth
Geoffrey of Monmouth

Unknown illustrator. Per Nigel Morgan Survey, probably London, 1250 or earlier. Style of Matthew Paris, but not him. · Public domain
- Name
- Geoffrey of Monmouth
- Birth Name
- Galfridus Arturus
- Born
- c. 1095
- Birthplace
- Possibly Monmouth, Wales
- Died
- c. 1155
- Occupation
- Catholic cleric
- Known for
- Historia Regum BritanniaeProphetiae MerliniVita Merlini
- Nationality
- Kingdom of England · Kingdom of Glywysing
- Education
- University of Oxford
- Languages
- medieval Latin
VALÉORINE Encyclopedia
VALÉORINE documentary reading
Documentary summary
Geoffrey of Monmouth (Galfridus Monemutensis, Galfridus Arturus; Gruffudd ap Arthur, Sieffre o Fynwy; c. 1095) was a Christian cleric from Monmouth, Wales, and one of the major figures in the popularity of tales of King Arthur. He is best known for his chronicle The History of the Kings of Britain (De gestis Britonum or Historia Regum Britanniae) which was widely popular in its day, being translated into other languages from its original Latin.
Admitted source layer · organised and presented by VALÉORINE
Note VALÉORINE
No house-authored Note is published until its assertions and sources pass the VALÉORINE evidence contract. The documentary article remains available in full while that enrichment is being consolidated.
Documentary enrichment in progress · no unsupported statement published
Reference Check
Propose documentary evidence for Geoffrey of Monmouth. A contribution is never written directly as fact: identity, source, rights and evidence gates still decide.
Sign in to contribute
World of VALÉORINE
Documentary connections
Only confirmed graph relationships appear here. Images are shown only when their identity and reuse rights both pass the documentary gate.
Documentary evidence
Evidence Panel
not yet certified
- Identity
- resolved
- Independent source families
- 0
- Admitted assertions
- 0
- Open conflicts
- 0
Authority files
wikidata · Q188344 · wikipedia · Geoffrey of Monmouth
In this article
Biography
Biography
It was given historical credence well into the 16th century, but is now considered historically unreliable.
Geoffrey of Monmouth studied at University of Oxford. The recorded working language is medieval Latin. Positions recorded include Roman Catholic Bishop of St Asaph and diocesan bishop. Works named in the authority record are The History of the Kings of Britain, Prophetiae Merlini and Vita Merlini.
Key facts
Key facts
• Name — Geoffrey of Monmouth • Birth Name — Galfridus Arturus • Born — c. 1095 • Birthplace — Possibly Monmouth, Wales • Died — c. 1155 • Other Names — * Galfridus Monemutensis • Galfridus Arturus • Galfridus Artur • Gruffudd ap Arthur • Sieffre o Fynwy • Occupation — Catholic cleric • Known for — Historia Regum BritanniaeProphetiae MerliniVita Merlini
Ethnicity and background
Ethnicity and background
Geoffrey was born in Wales or the Welsh Marches. He refers to himself in his Historia as Galfridus Monemutensis (Geoffrey of Monmouth), which indicates a significant connection to Monmouth, Wales, and may refer to his birthplace. His works attest to some acquaintance with the place-names of the region. Geoffrey was known to his contemporaries as Galfridus Arturus or variants thereof. The "Arthur" in these versions of his name may indicate the name of his father or a nickname based on his scholarly interests. Earlier scholars assumed that Geoffrey was Welsh or at least spoke Welsh. His knowledge of this language appears to have been slight, however, and there is no evidence that he was of either Welsh or Cambro-Norman descent. He may have come from the same French-speaking elite of the Welsh border country as Gerald of Wales, Walter Map and Robert, Earl of Gloucester, to whom Geoffrey dedicated versions of his History. Sir Frank Stenton and others have suggested that Geoffrey's parents may have been among the many Bretons who took part in William the Conqueror's conquest and settled in the southeast of Wales. Monmouth had been in the hands of Breton lords since 1075 or 1086, and the names Galfridus and Arthur were more common among the Bretons than the Welsh. His ethnicity has been heavily debated by scholars. Some of the possibilities include Welsh, Breton, Norman, or even Cornish descent.
Life and career
Life and career
Geoffrey was born between about 1090 and 1100. He had reached the age of majority by 1129 when he is recorded as witnessing a charter. He may have served for a while in the Benedictine Monmouth Priory, but most of his adult life appears to have been spent outside Wales. Between 1129 and 1151, his name appears on six charters in the Oxford area, sometimes styled magister (teacher). He was probably a secular canon of St. George's college. All the charters signed by Geoffrey are also signed by Walter, Archdeacon of Oxford, a canon at that church. Another frequent co-signatory is Ralph of Monmouth, a canon of Lincoln. Archbishop Theobald of Bec consecrated Geoffrey as Bishop of St Asaph at Lambeth on 24 February 1152, having ordained him a priest at Westminster 10 days before. According to Lewis Thorpe, "There is no evidence that he ever visited his see, and indeed the wars of Owain Gwynedd make this most unlikely." He appears to have died between 25 December 1154 and 24 December 1155 according to Welsh chronicles, when his successor took office.
Works
Works
Geoffrey's structuring and shaping of the Merlin and Arthur myths engendered their vast popularity which continues today, and he is generally viewed by scholars as the major establisher of the Arthurian canon. The Historys effect on the legend of King Arthur was so vast that Arthurian works have been categorised as "pre-Galfridian" and "post-Galfridian", depending on whether or not they were influenced by him.
Historia Regum Britanniae
Historia Regum Britanniae
Geoffrey wrote several works in Latin, the language of learning and literature in Europe during the medieval period. His major work was the Historia Regum Britanniae (The History of the Kings of Britain), the work best known to modern readers. It relates the purported history of Britain, from its first settlement by Brutus of Troy, a descendant of Trojan hero Aeneas, to the death of Cadwaladr in the 7th century, covering Julius Caesar's invasions of Britain, kings Leir and Cymbeline, and one of the earliest developed narratives of King Arthur. Geoffrey claims in his dedication that the book is a translation of an "ancient book in the British language that told in orderly fashion the deeds of all the kings of Britain", given to him by Walter, Archdeacon of Oxford, but modern historians have dismissed this claim. It is likely, however, that the Archdeacon did furnish Geoffrey with some materials in the Welsh language which helped inspire his work, as Geoffrey's position and acquaintance with him would not have permitted him to fabricate such a claim outright. Much of it is based on the Historia Britonum, a 9th-century Welsh-Latin historical compilation, Bede's Ecclesiastical History of the English People, and Gildas's 6th-century polemic De Excidio et Conquestu Britanniae, expanded with material from bardic oral tradition and genealogical tracts, and embellished by Geoffrey's own imagination. In an exchange of manuscript material for their own histories, Robert of Torigny gave Henry of Huntingdon a copy of History, which both Robert and Henry used uncritically as authentic history and subsequently used in their own works, by which means Geoffrey's fictions became embedded in popular history. The History of the Kings of Britain is now usually considered a literary forgery containing little reliable history. This has since led many modern scholars to agree with William of Newburgh, who wrote around 1190 that "it is quite clear that everything this man wrote about Arthur and his successors, or indeed about his predecessors from Vortigern onwards, was made up, partly by himself and partly by others." Other contemporaries were similarly unconvinced by Geoffrey's History. For example, Gerald of Wales recounts the experience of a man possessed by demons: "If the evil spirits oppressed him too much, the Gospel of St John was placed on his bosom, when, like birds, they immediately vanished; but when the book was removed, and the History of the Britons by 'Geoffrey Arthur' [as Geoffrey named himself] was substituted in its place, they instantly reappeared in greater numbers, and remained a longer time than usual on his body and on the book." Geoffrey's major work was nevertheless widely disseminated throughout medieval Western Europe; Acton Griscom listed 186 extant manuscripts in 1929, and others have been identified since. It enjoyed a significant afterlife in a variety of forms, including translations and adaptations such as Wace's Old Norman-French Roman de Brut, Layamon's Middle English Brut, and several anonymous Middle Welsh versions known as Brut y Brenhinedd ("Brut of the Kings"). where it was generally accepted as a true account. In 2017, Miles Russell published the initial results of the Lost Voices of Celtic Britain Project established at Bournemouth University. The main conclusion of the study was that the Historia Regum Britanniae appears to contain significant demonstrable archaeological fact, despite being compiled many centuries after the period that it describes. Geoffrey seems to have brought together a disparate mass of source material, including folklore, chronicles, king-lists, dynastic tables, oral tales, and bardic praise poems, some of which was irrevocably garbled or corrupted. In doing so, Geoffrey exercised considerable editorial control, massaging the information and smoothing out apparent inconsistencies in order to create a single grand narrative which fed into the preferred narrative of the Norman rulers of Britain. Much of the information that he used can be shown to be derived from two discrete sources: • the orally transmitted, heroic tales of the Catuvellauni and Trinovantes, two essentially pre-Roman tribes inhabiting central south-eastern Britain at the very end of the Iron Age; • the king-lists of important post-Roman dynasties that ruled territories in western Britain. Stretching this source material out, chopping, changing and re-editing it in the process, Geoffrey added not just his own fictions but also additional information culled from Roman and early medieval histories and early medieval writers such as Gildas and Bede.
In popular culture
In popular culture
In the 2008 BBC series Merlin, the character of Geoffrey of Monmouth was played by Michael Cronin.
English translations available on the internet
English translations available on the internet
• Historia Regum Britanniae: • Histories of the Kings of Britain, tr. by Sebastian Evans, at Sacred Texts • By Aaron Thompson with revisions by J. A. Giles at http: www.yorku.ca/inpar/geoffrey_thompson.pdf. (PDF) • (Arthurian passages only) edited and translated by J. A. Giles at http: www.lib.rochester.edu/camelot/geofhkb.htm. • Vita Merlini, Basil Clarke's English translation from Life of Merlin: Vita Merlini (Cardiff: University of Wales Press, 1973) • At Jones the Celtic Encyclopedia • At Sacred-texts.com
Identity and origins
Identity and origins
The authorities additionally record the headings Geoffrey of Monmouth, Bishop of St. Asaph and Geoffrey Monmouth. His recorded language was medieval Latin. His recorded confession was Catholic Church.
Identity
Identity
Geoffrey of Monmouth is recorded as poet, historian, writer, catholic priest and catholic bishop.
Life and career
Dated record
Life and career
The full dated record · 2 entries
1100
Geoffrey of Monmouth was born in 1100 at Monmouth.
1150
Geoffrey of Monmouth died in 1150 at Llandaff Cathedral.
Places
Named by the record
Places
Only places the record itself states, plotted where the house gazetteer settles their coordinates. Nothing is inferred from a name or a nationality.
Monmouth.
Birth place
Llandaff Cathedral.
Death place
Other writings
Other writings
Geoffrey's earliest writing was probably the Prophetiae Merlini (Prophecies of Merlin) which he wrote before 1135, and which appears both independently and incorporated into The History of the Kings of Britain. It consists of a series of obscure prophetic utterances attributed to Merlin which he claimed to have translated from an unspecified language. The third work attributed to Geoffrey is the hexameter poem Vita Merlini (Life of Merlin), based more closely on traditional material about Merlin than the other works. Here he is known as Merlin of the Woods (Merlinus Sylvestris) or Scottish Merlin (Merlinus Caledonius) and is portrayed as an old man living as a crazed and grief-stricken outcast in the forest. The story is set long after the timeframe of the Historys Merlin, but the author tries to synchronise the works with references to the mad prophet's previous dealings with Vortigern and Arthur. The Vita did not circulate widely, and the attribution to Geoffrey appears in only one late-13th-century manuscript, but it contains recognisably Galfridian elements in its construction and content, and most critics recognise it as his.
Editions of the Latin text
Editions of the Latin text
* • Hammer, Jacob / Geoffrey of Monmouth, Historia regum Britanniae, a variant version. Edited by Jacob Hammer. Medieval Academy Books, No. 57 (1951). Medieval Academy Electronic Editions. Geoffrey of Monmouth, Second Variant version of the "Historia Regum Britannie" from Library of Matthew Parker. • Historia regum Britanniae, MS CUL Ff.1.25, Cambridge Digital Library. • Lewis E 247 Gesta regum Anglorum (Deeds of the English Kings); Historia regum Britanniae (History of the Kings of Britain) at OPenn
Where the work is held
Holdings and surviving copies
Where material relating to Geoffrey of Monmouth is held. The Historia regum Britanniæ of Geoffrey of Monmouth with contributions to the study of its place in early British history by Acton Griscom, M. The British history of Geoffrey of Monmouth.
Literature
Literature
Literature
Geoffrey of Monmouth and His Work, Geoffrey of Monmouth, 2010.
Geoffrey of Monmouth, Geoffrey of Monmouth, 2022
Geoffrey of Monmouth and Race, A Companion to Geoffrey of Monmouth, 2020
The German Reception of Geoffrey of Monmouth, A Companion to Geoffrey of Monmouth, 2020
Geoffrey of Monmouth, 2022
Geoffrey of Monmouth and Breton aristocracy in 12th century England: Social and political contexts of “On the deeds of the Britons”, Шаги, 2023
Scholarly footprint
Literature
Scholarly footprint
A count of publications is evidence of attention, not of standing, and is given here only as a measure.
Citations
References
Each reference names the institution holding it, so a reader may go to the document itself.
reference work
Wikidata, structured authority record Q188344: Geoffrey of MonmouthWikimedia Foundation
Partially resolvedreference work
Partially resolved
The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 14 August 2026.
Elsewhere in Books
38,960 published records in this field, each with its sources named.
- Geoffrey KeatingAuthor
- Geoffrey LehmannAuthor
- Geoffrey NutterAuthor
- Geoffrey of BeaulieuAuthor
- Geoffrey of VendômeAuthor
- Geoffrey of VillehardouinAuthor
- Geoffrey of VinsaufAuthor
- Geoffrey PhibbsAuthor
Best supported in this field
For owners
Own a work by Geoffrey of Monmouth?
A specialist will read what you send and tell you what the house can establish, what it cannot, and whether the object is suited to sale. There is no charge and no obligation. The object stays with you throughout; nothing is shipped to us unless it is arranged in writing beforehand.