53 publications between 1978 and 2019 indexed
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Works authored

Sims-Williams, Patrick, The Book of Llandaf as a historical source, Studies in Celtic History, Woodbridge: Boydell & Brewer, 2019.
Contents: Introduction; The Book of Llandaf and the early Welsh charter; The origin of the Llandaf claims; The charters in the Book of Llandaf: forgeries or recensions?; The authenticity of the witness lists; The integrity of the charters; The chronology of the charters; The status of the donors and recipients of the charters; The fake diplomatic of the Book of Llandaf; The Book of Llandaf: first edition or seventh enlarged revision?; A new approach to the compilation of the Book of Llandaf; The evidence of the doublets; The Book of Llandaf as an indicator of social and economic change; The royal genealogical framework; The episcopal framework; Afterword; Appendix I: Concordance and chart showing the paginal and chronological order of the charters; Appendix II: Maps of grants to bishops; Bibliography.
The early-twelfth-century Book of Llandaf is rightly notorious for its bogus documents - but it also provides valuable information on the early medieval history of south-east Wales and the adjacent parts of England. This study focuses on its 159 charters, which purport to date from the fifth century to the eleventh, arguing that most of them are genuine seventh-century and later documents that were adapted and "improved" to impress Rome and Canterbury in the context of Bishop Urban of Llandaf's struggles in 1119-34 against the bishops of St Davids and Hereford and the "invasion" of monks from English houses such as Gloucester and Tewkesbury. After assembling other evidence for the existence of pre-twelfth-century Welsh charters, the author defends the authenticity of most of the Llandaf charters' witness lists, elucidates their chronology, and analyses the processes of manipulation and expansion that led to the extant Book of Llandaf. This leads him to reassess the extent to which historians can exploit the rehabilitated charters as an indicator of social and economic change between the seventh and eleventh centuries and as a source for the secular and ecclesiastical history of south-east Wales and western England.
Sims-Williams, Patrick, Buchedd Beuno: the Middle Welsh Life of St Beuno, Dublin: Dublin Institute for Advanced Studies, School of Celtic Studies, 2018.
Beuno was a seventh-century abbot, active in eastern and north-western Wales. The fourteenth-century Middle Welsh Life of St Beuno is an attractive literary text which is also important historically, being based on a lost Latin original, as shown in the comprehensive introduction to this edition. As the language of the text is unusually simple, the edition is accompanied by a short grammar of Middle Welsh and a full glossary so that it can be used by complete beginners.
Sims-Williams, Patrick, Irish Influence on medieval Welsh literature, Oxford Scholarship Online, Online ed., Online: Oxford University Press. URL: <>.
Sims-Williams, Patrick, Irish Influence on medieval Welsh literature, Oxford: Oxford University Press, 2010.
See also the web edition: Patrick Sims-Williams, Irish Influence on medieval Welsh literature (2011).
Raybould, Marilynne E., and Patrick Sims-Williams, Introduction and supplement to the Corpus of Latin inscriptions, Aberystwyth: CMCS Publications, 2009.
In this second volume Raybould and Sims-Williams complete their Corpus of Latin inscriptions of the Roman Empire containing Celtic personal names with a final collection of texts and translations. They also list and analyse the Celtic names found in both volumes and map their geographical spread, from the Atlantic to the Black Sea.

The illustration on the front cover shows part of a second-century tombstone in the museum at Mannersdorf am Leithagebirge, Austria (no. PAN 113 in this Supplement). Nertomarus and his wife Toutomara erected it to commemorate themselves. His name Nertomarus is from Celtic nerto- 'strength' and maros 'great' (compare medieval Irish nertmar and Welsh nerthfawr 'strong'), while Touto- mara combines touto- 'people, land' (Irish tuath, Welsh tud) with the feminine mara 'great'.
Sims-Williams, Patrick, and Gruffydd Aled Williams (eds.), Croesi ffiniau: Trafodion y 12fed Gyngres Astudiaethau Celtaidd Ryngwladol 24–30 Awst 2003, Prifysgol Cymru, Aberystwyth / Crossing boundaries: Proceedings of the 12th International Congress of Celtic Studies, 24–30 August 2003, University of Wales, Aberystwyth, Cambrian Medieval Celtic Studies 53, 54, Aberystwyth: CMCS Publications, 2007.
Raybould, Marilynne E., and Patrick Sims-Williams, A corpus of Latin inscriptions of the Roman Empire containing Celtic personal names, Aberystwyth: CMCS Publications, 2007.
Raybould, Marilynne E., and Patrick Sims-Williams, The geography of Celtic personal names in the Latin inscriptions of the Roman Empire, Aberystwyth: CMCS Publications, 2007.
Cousin, Georges, Llinos Dafis, Ashwin E. Gohil, Xavier Delamarre, G. R. Isaac, and Patrick Sims-Williams, Additions to Alfred Holder’s Celtic thesaurus; together with an electronically searchable version of Holder’s headwords and indexes to Joshua Whatmough’s ‘The dialects of ancient Gaul’, Aberystwyth: CMCS Publications, 2006.
Sims-Williams, Patrick, The iron house in Ireland, H. M. Chadwick Memorial Lectures 16, Cambridge: Department of Anglo-Saxon, Norse and Celtic, University of Cambridge, 2006.

Works edited

de Hoz, Javier, Eugenio R. Luján, and Patrick Sims-Williams (eds.), New approaches to Celtic place-names in Ptolemy’s Geography, Madrid: Ediciones Clásicas, 2005.
Parsons, David N., and Patrick Sims-Williams (eds), Ptolemy: towards a linguistic atlas of the earliest Celtic place-names of Europe, Aberystwyth: CMCS Publications, 2000.

Contributions to journals

Sims-Williams, Patrick, “IE *peug′‐ /*peuk′‐ ‘to pierce’ in Celtic: Old Irish og ‘sharp point’, ogam, and uaigid ‘stitches’, Gallo‐Latin Mars Ugius, Old Welsh ‐ug and Middle Welsh ‐y ‘fist’, Middle Welsh vch ‘fox’, and ancient names like Uccius”, Transactions of the Philological Society 116:1 (March, 2018): 117–130.

A systematic search for Celtic derivatives of IE *peug′‐ /*peuk′‐ ‘to pierce’ illustrates the extent to which Indo‐European etymological dictionaries have tended to overlook the existence of cognates in the Celtic languages.

Sims-Williams, Patrick, “The earliest Celtic ethnography”, Zeitschrift für celtische Philologie 64 (2017): 421–442.
Sims-Williams, Patrick, “The four types of Welsh yn”, Transactions of the Philological Society 113:3 (2015): 271–406.

This paper discusses and categorises the various medieval and modern Welsh prepositions and particles yn and the initial mutations that follow them. It investigates possible manuscript variants such as Old Welsh int and it and Middle Welsh y, and examines variations in mutation. Historical explanations are suggested, including a new explanation of the absence of mutation in the productive yn + verbal noun construction, which is argued to have spread from the construction in which possessive pronouns between yn and the verbal nouns of intransitive stative verbs prevented yn from mutating the verbal nouns.

Sims-Williams, Patrick, “Powys and early Welsh poetry”, Cambrian Medieval Celtic Studies 67 (Summer, 2014): 33–54.
Sims-Williams, Patrick, “Variation in Middle Welsh conjugated prepositions: chronology, register and dialect”, Transactions of the Philological Society 111:1 (March, 2013): 1–50.
Sims-Williams, Patrick, “Celtic civilization: continuity or coincidence?”, Cambrian Medieval Celtic Studies 64 (Winter, 2012): 1–45.
Sims-Williams, Patrick, “The spread of ‘sandhi h-’ in thirteenth-century Welsh”, Transactions of the Philological Society 108:1 (March, 2010): 41–52.
After a hiatus following the Old Welsh period, Welsh manuscript evidence resumes c. 1250, and can now be studied in minute detail owing to the construction of a palaeographical chronology for the manuscripts and the availability of machine-readable and other modern editions. These reveal that the so-called ‘sandhi h-’ after first-person pronouns in modern literary Welsh is not ancient, but slowly emerged in the late thirteenth century as a hypercorrect phonetic tendency after nasal consonants which gradually became grammaticalised after pronouns ending in a nasal.
Sims-Williams, Patrick, “Shrewsbury School MS 7 and the Breton lays”, Cambrian Medieval Celtic Studies 60 (Winter, 2010): 39–80.
Sims-Williams, Patrick, “Person switching in Celtic panegyric: figure or fault?”, in: Nagy, Joseph Falaky, and Leslie Ellen Jones (eds.), Heroic poets and poetic heroes in Celtic tradition. A Festschrift for Patrick K. Ford, CSANA Yearbook 3, 4, Dublin: Four Courts Press, 2005. 315–326.
Sims-Williams, Patrick, “Welsh Iâl, Gaulish names in Ial- and -ialo-, and the god Ialonus”, Cambrian Medieval Celtic Studies 49 (Summer, 2005): 57–72.
Sims-Williams, Patrick, “A new Brittonic gloss on Boethius: ud rocashaas”, Cambrian Medieval Celtic Studies 50 (Winter, 2005): 77–86.
Sims-Williams, Patrick, “The five languages of Wales in the pre-Norman inscriptions”, Cambrian Medieval Celtic Studies 44 (Winter, 2002): 1–36.
Sims-Williams, Patrick, “Celtomania and Celtoscepticism”, Cambrian Medieval Celtic Studies 36 (Winter, 1998): 1–36.
Sims-Williams, Patrick, “The death of Urien”, Cambrian Medieval Celtic Studies 32 (Winter, 1996): 25–56.
Sims-Williams, Patrick, “The provenance of the Llywarch Hen poems: a case for Llan-gors, Brycheiniog”, Cambrian Medieval Celtic Studies 26 (Winter, 1993): 27–63.
Sims-Williams, Patrick, “Some problems in deciphering the early Irish Ogam alphabet”, Transactions of the Philological Society 91 (1993, 1993): 133–180.
Sims-Williams, Patrick, “The submission of Irish kings in fact and fiction: Henry II, Bendigeidfran, and the dating of The four branches of the Mabinogi”, Cambridge Medieval Celtic Studies 22 (Winter, 1991): 31–61.
Sims-Williams, Patrick, “The visionary Celt: the construction of an ‘ethnic preconception’”, Cambridge Medieval Celtic Studies 11 (Summer, 1986): 71–96.
Sims-Williams, Patrick, “The double system of verbal inflexion in Old Irish”, Transactions of the Philological Society 82 (1984, 1984): 138–201.
Sims-Williams, Patrick, “Gildas and the Anglo-Saxons”, Cambridge Medieval Celtic Studies 6 (Winter, 1983): 1–30.
Sims-Williams, Patrick, “The settlement of England in Bede and the Chronicle”, Anglo-Saxon England 12 (1983): 1–41.
Sims-Williams, Patrick, “Thought, word and deed: an Irish triad”, Ériu 29 (1978): 78–111.

Contributions to edited collections or authored works

Sims-Williams, Patrick, “The Welsh versions of Geoffrey of Monmouth’s ‘History of the Kings of Britain’”, in: Harlos, Axel, and Neele Harlos (eds), Adapting texts and styles in a Celtic context: interdisciplinary perspectives on processes of literary transfer in the middle ages: studies in honour of Erich Poppe, Studien und Texte zur Keltologie 13, Münster: Nodus Publikationen, 2016. 53–74.
Sims-Williams, Patrick, “The Celtic composition vowels -i- and -u-”, in: Oudaer, Guillaume, Gaël Hily, and Herve Le Bihan (eds), Mélanges en l’honneur de Pierre-Yves Lambert, Rennes: TIR, 2015. 313–331.
Sims-Williams, Patrick, “Leprechauns and Luperci, Aldhelm and Augustine”, in: Carey, John, Kevin Murray, and Caitríona Ó Dochartaigh (eds), Sacred histories: a Festschrift for Máire Herbert, Dublin: Four Courts Press, 2015. 409–418.
Sims-Williams, Patrick, “Post-Celtoscepticism: a personal view”, in: Ó Baoill, Dónall, Donncha Ó hAodha, and Nollaig Ó Muraíle (eds), Saltair saíochta, sanasaíochta agus seanchais: A festschrift for Gearóid Mac Eoin, Dublin: Four Courts Press, 2013. 422–428.
Sims-Williams, Patrick, “The Celtic composition vowels -o- and -io-”, in: García Alonso, Juan Luis [ed.], Continental Celtic word formation: the onomastic data, Aquilafuente 197, Salamanca: Ediciones Universidad de Salamanca, 2013. 37–50.
Sims-Williams, Patrick, “Tochmarc Becfhola: a ‘peculiar confused tale’?”, in: Eska, Joseph F. [ed.], Narrative in Celtic tradition: essays in honor of Edgar M. Slotkin, CSANA Yearbook 8, 9, New York: Colgate University Press, 2011. 228–234.
Sims-Williams, Patrick, “Comparing the distribution of Celtic personal names with that of Celtic place-names”, in: García Alonso, Juan Luis [ed.], Celtic and other languages in ancient Europe, Aquilafuente 127, Salamanca: Ediciones Universidad de Salamanca, 2008. 29–51.
Sims-Williams, Patrick, “The importance of being Patrick”, in: Smelik, Bernadette, Rijcklof Hofman, Camiel Hamans, and David Cram (eds.), A companion in linguistics: a Festschrift for Anders Ahlqvist on the occasion of his sixtieth birthday, Nijmegen: Stichting Uitgeverij de Keltische Draak, 2005. 26–35.
Sims-Williams, Patrick, “[Multiple contributions]”,. URL: <>.
Sims-Williams, Patrick, “Degrees of Celticity in Ptolemy’s names: examples from Wales”, in: Parsons, David N., and Patrick Sims-Williams (eds), Ptolemy: towards a linguistic atlas of the earliest Celtic place-names of Europe, Aberystwyth: CMCS Publications, 2000. 1–15.
Sims-Williams, Patrick, “The uses of writing in early medieval Wales”, in: Pryce, Huw [ed.], Literacy in medieval Celtic societies, Cambridge Studies in Medieval Literature 33, Cambridge, New York, Melbourne: Cambridge University Press, 1998. 15–38.
Sims-Williams, Patrick, “Byrhtferth’s ogam signature”, in: Jones, Tegwyn, and E. B. Fryde (eds), Ysgrifau a cherddi cyflwynedig i Daniel Huws: Essays and poems presented to Daniel Huws, Aberystwyth: National Library of Wales, 1994. 283–291.
Sims-Williams, Patrick, “Oratio sancti Isidori pro omnibus Christianis”, in: Conso, Danièle, Nicole Fick, and Bruno Poulle (eds), Mélanges François Kerlouégan, Annales littéraires de l'Université de Besançon 515, Paris: Les Belles Lettres, 1994. 579–601.
Sims-Williams, Patrick, “The early Welsh Arthurian poems”, in: Bromwich, Rachel, A. O. H. Jarman, and Brynley F. Roberts (eds.), The Arthur of the Welsh. The Arthurian legend in medieval Welsh literature, Arthurian Literature in the Middle Ages 1, Cardiff: University of Wales Press, 1991. 33–71.
Sims-Williams, Patrick, “Some Celtic otherworld terms”, in: Matonis, A. T. E., and Daniel F. Melia (eds.), Celtic language, Celtic culture: a festschrift for Eric P. Hamp, Van Nuys, California: Ford & Bailie, 1990. 57–81.
Sims-Williams, Patrick, “Irish elements in late medieval Welsh literature: the problem of Cuhelyn and *Nyf”, in: Ball, Martin J., James Fife, Erich Poppe, and Jenny Rowland (eds.), Celtic linguistics / Ieithyddiaeth Geltaidd: readings in the Brythonic languages. Festschrift for T. Arwyn Watkins, Amsterdam Studies in the Theory and History of Linguistic Science 4.68, Current Issues in Linguistic Theory, Amsterdam: Benjamins, 1990. 277–295.
Sims-Williams, Patrick, “The Irish geography of Culhwch and Olwen”, in: Ó Corráin, Donnchadh, Liam Breatnach, and Kim R. McCone (eds.), Sages, saints and storytellers: Celtic studies in honour of Professor James Carney, Maynooth Monographs 2, Maynooth: An Sagart, 1989. 412–426.
Sims-Williams, Patrick, “Gildas and vernacular poetry”, in: Lapidge, Michael, and David N. Dumville (eds.), Gildas: new approaches, Studies in Celtic History 5, Cambridge: Boydell Press, 1984. 169–192.
Sims-Williams, Patrick, “The evidence for vernacular Irish literary influence on early mediaeval Welsh literature”, in: Whitelock, Dorothy, Rosamund McKitterick, and David N. Dumville (eds.), Ireland in early medieval Europe: studies in memory of Kathleen Hughes, Cambridge: Cambridge University Press, 1982. 235–257.