Photograph of Patrick Sims-Williams.Patrick Sims-Williams

Professor of Celtic Studies
MA (Cantab.), PhD (Birmingham), FBA

Contact

Email: pps@aber.ac.uk
Office: D19, Hugh Owen Building
Phone: +44 (0)1970 622137

Research

Professor Sims-Williams recently completed a book on Irish influence on medieval Welsh literature which will be published by Oxford University Press in 2010. He also does research on the early Celtic languages, including Old Irish, Old and Middle Welsh, and the ancient Continental Celtic languages. He recently published a two-volume study of Roman inscriptions containing Celtic personal names, jointly with Marilynne E. Raybould (2007, 2009),  and he is currently writing the linguistic commentary for the third and final volume of A Corpus of Early Medieval Inscribed Stones and Stone Sculpture in Wales (2007- ). In 2009 he delivered the John V. Kelleher Lecture in Harvard University on ‘How our understanding of early Irish literature has progressed’. He has edited Cambrian Medieval Celtic Studies since 1981. He is a Fellow of the British Academy and directs the Academy’s research project on the Development of the Welsh Language (Datblygiad yr Iaith Gymraeg).

Staff Publications

‘Continental Influence at Bath Monastery in the Seventh Century’, Anglo-Saxon England, 4 (1975), 1-10.  

‘Cuthswith, Seventh-Century Abbess of Inkberrow, near Worcester, and the Würzburg Manuscript of Jerome on Ecclesiastes’, Anglo-Saxon England, 5 (1976), 1-21.  

‘Riddling Treatment of the “Watchman Device” in Branwen and Togail Bruidne Da Derga’, Studia Celtica, 12/13 (1977-78), 83-117. 

‘"Is it Fog or Smoke or Warriors Fighting?": Irish and Welsh Parallels to the Finnsburg Fragment’, Bulletin of the Board of Celtic Studies, 27 (1976- 78), 505-14.  

‘Thought, Word and Deed: An Irish Triad’, Ériu, 29 (1978), 78-111.  

‘anfab2, “illegitimate child”: A Ghost-Word’, Bulletin of the Board of Celtic Studies, 28 (1978-80), 90-93.       

‘Report on a Course held in the Computer Unit of the University College of Wales, Aberystwyth, 10th-14th April 1978, on the Use of Computers in Textual Analysis and Bibliography’, Bulletin of the Association for Literary  and Linguistic Computing, 6 (1978), 159-60.  

gan: Poems of Taliesin III. 5’, Bulletin of the Board of Celtic Studies, 28 (1978-80), 402-3.  

‘An Unpublished Seventh- or Eighth-Century Anglo-Latin Letter in Boulogne-sur-Mer MS 74 (82)’, Medium Ævum, 48 (1979), 1-22.       

Review: A Welsh Grammar by Stephen J. Williams (Cardiff, 1980). British Book News (November 1980), pp. 669-70.       

Review: A Guide to Welsh Literature, II, edited by A. O. H. Jarman and Gwilym Rees Hughes (Swansea, 1980).  British Book News (November 1980), pp. 695-96.  

‘The Development of the Indo-European Voiced Labiovelars in Celtic’, Bulletin of the Board of Celtic Studies, 29 (1980-82), 201-29 and 690.       

Review: Celtic Folklore, Welsh and Manx by John Rhys (reprinted London, 1980); and Welsh Folklore and Folk-Custom by T. Gwynn Jones, reprinted with introduction by Arthur ap Gwynn (Cambridge and Woodbridge, 1979).  Cambridge Medieval Celtic Studies, 1 (Summer 1981), 101.       

Editor: ‘The Celtic Church: Is This a Valid Concept?’ by the late Kathleen Hughes [Oxford O’Donnell Lecture for 1974-75].  Cambridge Medieval Celtic Studies, 1 (Summer 1981), 1-20.  

‘Milred of Worcester’s Collection of Latin Epigrams and its Continental Counterparts’, Anglo-Saxon England, 10 (1982), 21-38.        

Review: Gaelic Personal Names by Donnchadh Ó Corráin and Fidelma  Maguire (Dublin, 1981).  Cambridge Medieval Celtic Studies, 2 (Winter 1981), 94.  

Review: The Text of the Book of Llan Dâv, edited by J. Gwenogvryn Evans with John Rhys (reprinted Aberystwyth, 1979); The Llandaff Charters by Wendy Davies (Aberystwyth, 1979); and An Early Welsh Microcosm by Wendy Davies (London, 1978).  Journal of Ecclesiastical History, 33 (1982), 124-29.       

Review: The Cynfeirdd: Early Welsh Poets and Poetry by A. O. H. Jarman (Cardiff, 1981).  British Book News (May 1982), pp. 322-23.  

‘The Evidence for Vernacular Irish Literary Influence on Early Mediaeval Welsh Literature’, in Ireland in Early Mediaeval Europe: Studies in memory of Kathleen Hughes, edited by Dorothy Whitelock, Rosamond McKitterick, and David Dumville (Cambridge, 1982), pp. 235-57.                                    

‘The Significance of the Irish Personal Names in Culhwch ac Olwen’, Bulletin of the Board of Celtic Studies, 29 (1980-82), 600-20.       

Review: The Place-Names of Roman Britain by A. L. F. Rivet and Colin Smith (London, 1979).  Cambridge Medieval Celtic Studies, 4 (Winter 1982), 90-93.  

‘Dafydd ap Gwilym and Celtic Literature’, in Medieval Literature: The European Inheritance, The New Pelican Guide to English Literature, edited by Boris Ford, Volume 1, Part 2 (Harmondsworth, 1983), pp. 301-17; and translations of 4 poems on pp. 541-46.  

‘Gildas and the Anglo-Saxons’, Cambridge Medieval Celtic Studies, 6 (Winter 1983), 1-30. [O’Donnell Lecture, University of Oxford, 1982]

‘The Settlement of England in Bede and the Chronicle’, Anglo-Saxon England, 12 (1983), 1-41. [O’Donnell Lecture, University of Oxford, 1982]

‘William of Malmesbury and La silloge epigrafica  di Cambridge’, Archivum Historiae Pontificiae, 21 (1983), 9-33.  

‘The Double System of Verbal Inflexion in Old Irish’, Transactions of the Philological Society, 1984, pp. 138-201.  

‘Gildas and Vernacular Poetry’, in Gildas: New Approaches, edited by Michael Lapidge and David Dumville (Woodbridge, 1984), pp. 169-92.       

Review: The Saints of Gwynedd by Molly Miller (Woodbridge, 1979). Journal of Ecclesiastical History, 36 (1985), 144-45.       

Review: Celtic Britain in the Early Middle Ages: Studies in Scottish  and Welsh Sources by Kathleen Hughes (Woodbridge, 1980).  Journal of Ecclesiastical History, 36 (1985), 306-9.  

‘Thoughts on Ephrem the Syrian in Anglo-Saxon England’, in Learning and Literature in Anglo-Saxon England: Studies presented to Peter Clemoes on the occasion of his Sixty-Fifth Birthday, edited by Michael Lapidge and Helmut Gneuss (Cambridge, 1985), pp. 205-26.  

‘Cyfieithiadau o Waith y Gogynfeirdd: Llyfryddiaeth  Fer’, in Ysgrifau Beirniadol XIII, edited by J. E. Caerwyn Williams (Denbigh, 1985), pp. 39-47.  

‘Some Functions of Origin Stories in Early Medieval Wales’, in History and Heroic Tale: A Symposium (Proceedings of the Eighth International Symposium organized by the Centre for the Study of Vernacular Literature in the Middle Ages, held at Odense University on 21-22 November 1983), edited by Tore Nyberg, Iørn Piø, Preben Meulengracht Sørensen, and Aage Trommer (Odense, 1985), pp. 97-131. [Reprinted in The Celtic World: Critical Concepts in Historical Studies, edited by Raimund Karl and David Stifter (London: Routledge, 2007), Chapter 49.]   

Review: Ideal and Reality in Frankish and Anglo-Saxon Society: Studies presented to J. M. Wallace-Hadrill, edited by Patrick Wormald  with Donald Bullough and Roger Collins (Oxford, 1983).  Journal of Ecclesiastical History, 37 (1986), 114-17.       

Review: The Peoples of Ireland: From Prehistory to Modern Times by Liam de Paor (London, 1986).  British Book News (September 1986), pp. 555-56.  

‘The Visionary Celt: The Construction of an Ethnic Preconception’, Cambridge Medieval Celtic Studies, 11 (Summer 1986), 71-96.  [1986 O’Donnell Lecture in the University of Edinburgh]       

Review: Bibliography of Irish Linguistics and Literature 1942-71 by Rolf Baumgarten (Dublin, 1986).  Cambridge Medieval Celtic Studies, 13 (Summer 1987), 104-5.       

Editor: ‘The Distribution of Infixed and Suffixed Pronouns in Old Irish’ by the late Warren Cowgill, Cambridge Medieval Celtic Studies, 13 (Summer 1987), 1-5.  

‘St Wilfrid and Two Charters dated AD 676 and 680’, Journal of Ecclesiastical History, 39 (1988), 163-83.  

William Morgan (1545-1604). [Supplement to The Eagle.] (St John’s College, Cambridge, 1988).  

‘Fionn and Deirdre in Late Medieval Wales’, Éigse, 23 (1989), 1-15.  

‘The Irish Geography of Culhwch and Olwen’, in Sages, Saints and Storytellers: Celtic Studies in honour of James Carney, edited by Donnchadh Ó Corráin, Liam Breatnach, and Kim McCone, Maynooth Monographs 2 (Maynooth, 1989), pp. 412-26.       

‘A Lost Epic Recovered’: Review of Aneirin: Y Gododdin, Britain’s Oldest Heroic Poem, edited and translated by A. O. H. Jarman, The Welsh Classics, 3 (Llandysul, 1988). Times Literary  Supplement, 21-27 April 1989, p. 434.      

Review: The Liturgy  and Ritual of the Celtic Church by F. E. Warren, second edition by Jane Stevenson, Studies in Celtic History, 9 (Woodbridge, 1987): Journal of Ecclesiastical History, 40 (1989), 594-95.  

‘Dating the Transition to Neo-Brittonic: Phonology and History, 400-600’, in Britain  400-600: Language and History, edited by Alfred Bammesberger and Alfred Wollmann, Anglistische Forschungen 205 (Heidelberg, 1990), pp. 217-61.  

‘Some Celtic Otherworld Terms’, in Celtic Language, Celtic Culture: A Festschrift for Eric  P. Hamp, edited by A. T. E. Matonis and Daniel F. Melia (Van Nuys, California, 1990), pp. 57-81.  

Religion and Literature  in Western England, 600-800  (Cambridge: Cambridge University Press, 1990). xv + 448 pp. [Reprinted  2005.]

Review: Nomina: A Journal of Name Studies Relating to Great Britain   and Ireland, 7-11 (1983-87). Cambridge Medieval Celtic Studies, 19 (Summer 1990), 88.  

‘Cú Chulainn in Wales: Welsh Sources for Irish Onomastics’, Celtica, 21 (1990), 620-33.  

‘Irish Elements in Late Medieval Welsh Literature: The Problem of Cuhelyn and *Nyf’, in Celtic Linguistics/  Ieithyddiaeth Geltaidd: Readings in the Brythonic Languages, Festschrift for T. Arwyn Watkins, edited by Martin J. Ball, James Fife, Erich Poppe, and Jenny Rowland, Current Issues in Linguistic Theory, 68 (Amsterdam, 1990), pp. 277-95.       

Obituary: Kenneth Jackson. The Guardian, 23 February 1991, p. 21.  

‘The Early Welsh Arthurian  Poems’, in The Arthur of the Welsh, edited by Rachel Bromwich, A. O. H. Jarman, and Brynley F. Roberts (Cardiff, 1991), pp. 33-71.  

‘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.  

‘The Emergence of Old Welsh, Cornish and Breton Orthography, 600-800: The Evidence of Archaic Old Welsh’, Bulletin of the Board of Celtic Studies, 38 (1991), 20-86.       

Review: The Journal of Celtic Linguistics, vol. 1. The Times Literary Supplement, 26 June 1992, p. 25.       

Review: The Welsh Life of St David, edited by D. Simon Evans (Cardiff: University of Wales Press, 1988). Journal of Ecclesiastical History, 43 (1992), 468-70.  

‘The Additional Letters of the Ogam Alphabet’, Cambridge Medieval Celtic Studies, 23 (Summer 1992), 29-75.       

Review:  Early Monasteries in Cornwall  by Lynette Olson, Studies in Celtic History, 11 (Woodbridge: Boydell Press 1989). English Historical Review, 107 (1992), 978-79.       

Review: Rome, Britain and the Anglo-Saxons by Nicholas Higham (London: Seaby 1992). Times Literary  Supplement, 1 January 1993, p. 10.       

Review: Langue et littérature bretonnes: bibliographie, II, 1983-1988  by F. Broudic (Brest: Brud Nevez, 1990) and A Celtic studies bibliography  for 1986-1988  edited by A. T. E. Matonis and Jean Rittmueller (Philadelphia: Celtic Studies Association of North America, 1990). Cambridge Medieval Celtic Studies, 24 (Winter 1992), 108-9.  

‘Le lingue celtiche’, in Le lingue indoeuropee, edited by Anna Giacalone Ramat and Paolo Ramat (Bologna: il Mulino, 1993), pp. 373-408.  

‘The Provenance of the Llywarch Hen Poems: A Case for Llan-gors, Brycheiniog’, Cambrian Medieval Celtic Studies, 26 (Winter 1993), 27-63.  

[unsigned] ‘Indices to Cambridge Medieval Celtic Studies (1981-93)’, Cambrian Medieval Celtic Studies, 26 (Winter 1993), 81-94.  

‘Some Problems in Deciphering the Early Irish Ogam Alphabet’, Transactions of the Philological Society, 91 (1993), 133-80.  

‘Oratio sancti Isidori pro omnibus Christianis’, in Mélanges François Kerlouégan, edited by Danièle Conso, Nicole Fick, and Bruno Pouelle, Annales Littéraires  de l’Université de Besançon, 15 (Paris: Les Belles Lettres, 1994), pp. 579-601.  

‘Historical Need and Literary Narrative: A Caveat from Ninth-Century Wales’, Welsh History Review, 17 (1994-95), 1-40.       

Review: Early Welsh Saga Poetry: A Study and Edition of the Englynion  by Jenny Rowland (Cambridge: D. S. Brewer, 1990). Cambrian Medieval Celtic Studies, 27 (Summer 1994), 88-91.  

 ‘Byrhtferth’s Ogam Signature’, in Ysgrifau a Cherddi cyflwynedig i Daniel Huws / Essays and Poems presented to Daniel Huws, edited by Tegwyn Jones and E. B. Fryde (Aberystwyth: Llyfrgell Genedlaethol Cymru / National Library of Wales, 1994), pp. 283-91.

Review: The Mabinogi by Proinsias Mac Cana, Writers of Wales, second edition (Cardiff: University of Wales Press, 1992).  Cambrian Medieval Celtic Studies, 28 (Winter 1994), 109-10.        

Review: The English Conquest: Gildas and Britain in the Fifth Century  by N. J. Higham  (Manchester: Manchester University Press, 1994). Times Literary Supplement, 26 May 1995, p. 27.  

‘Indo-European *gwh in Celtic, 1894-1994’, in  Hispano-Gallo-Brittonica: Essays in honour of Professor D. Ellis Evans on the occasion of his Sixty-Fifth Birthday, edited by Joseph F. Eska, R. Geraint Gruffydd, and Nicolas Jacobs (Cardiff: University of Wales Press, 1995), pp. 196-218.     

Review:  The West Midlands in the Early Middle Ages  by Margaret Gelling (Leicester: Leicester University Press, 1992). English Historical Review, 110 (1995),  964-65.           

Review: Galar y Beirdd: Marwnadau’r Plant / Poets’ Grief: Medieval Welsh Elegies for Children, edited and translated by Dafydd Johnston (Cardiff: Tafol, 1993). Cambrian Medieval Celtic Studies, 29 (Summer 1995), 60-62.

Britain and Early Christian Europe: Studies in Early Medieval History and Culture(Aldershot: Variorum,  1995).  x + 337 pp.  

Review: The Irish Tradition  in Old English Literature by Charles D. Wright, Cambridge Studies in Anglo-Saxon England, 6 (Cambridge: Cambridge University Press, 1993). Early Medieval Europe, 4 (1995), 248-50.

‘Edward IV’s Confirmation Charter for Clynnog Fawr’, in Recognitions: Essays presented to  Edmund  Fryde, edited by Colin Richmond and Isobel Harvey (Aberystwyth: National Library  of Wales, 1996), pp. 229-41.

‘The Invention of Celtic Nature Poetry’, in Celticism, edited by Terence Brown, Studia Imagologica: Amsterdam Studies on Cultural Identity, 8 (Amsterdam and Atlanta: Editions Rodopi, 1996), pp. 97-124.

Review: Pagan Past and Christian Present in Early Irish Literature  by Kim McCone, Maynooth Monographs, 3 (Maynooth: An Sagart, 1990). Éigse, 29 (1996), 179-96.

‘The Death of Urien’, Cambrian Medieval Celtic Studies, 32 (Winter 1996), 25-56.

Review: Rudolf Thurneysen: Gesammelte Schriften, edited by Patrizia de Bernardo Stempel and Rolf Ködderitzsch, 3 vols, Buchreihe der Zeitschrift für celtische Philologie, 8-10. Tübingen: Niemeyer. 1991-95. Cambrian Medieval Celtic Studies,32 (Winter 1996), 123-25.

‘The Celtic Languages’, in The Indo-European Languages, edited by Anna Giacalone Ramat and Paolo Ramat (London: Routledge, 1998), pp. 345-79. [Revised English version of ‘Le lingue celtiche’, in Le lingue indoeuropee, edited by Anna Giacalone Ramat and Paolo Ramat (Bologna: il Mulino, 1993), pp. 373-408.]

‘The Uses of Writing in Early Medieval Wales’, in Literacy  in  Medieval Celtic Societies, edited by Huw Pryce (Cambridge: Cambridge University Press, 1998), pp. 15-38.

‘The Medieval World of Robin Flower’, in Bláithín: Flower, edited by Mícheál de Mórdha, Ceiliúradh an Bhlascaoid, 1 (Dingle: An Sagart, 1998), pp. 73-96.

‘Did Itinerant Breton Conteurs Transmit the Matière  de Bretagne?’, Romania, 116 (1998), 72-111.

‘Genetics, Linguistics  and Prehistory: Thinking Big and Thinking Straight’, Antiquity,72 (1998), 505-27. [awarded AntiquityPrize for 1998 (for ‘Best Paper’ in 1998)]

Review: Dictionary of Celtic Mythology by James MacKillop (Oxford: Oxford University Press, 1998). Times Literary Supplement, 1 January 1999, p. 25.

‘Celtomania and Celtoscepticism’, Cambrian Medieval Celtic Studies, 36 (Winter 1998), 1-35. [Reprinted in The Celtic World: Critical Concepts in Historical Studies, edited by Raimund Karl and David Stifter (London: Routledge, 2007), Chapter 8.]   

‘A Turkish–Celtic Problem in Chrétien de Troyes: The Name Cligés’, in Ildánach, Ildírech: A Festschrift for Proinsias Mac Cana, edited by John Carey, John T. Koch, and Pierre-Yves Lambert (Andover, MA, and Aberystwyth, 1999), pp. 215-30.

‘Le post-celtoscepticisme tel que je le vois’, Hopala ! — débats de bretagne et d’ailleurs [Plougastel-Daoulas], 2 (septembre-novembre 1999), 54-60.

‘How Are You Finding It Here?’ Review of: Simon James, The Atlantic Celts: Ancient People or Modern Invention?  (London: British Museum Press, 1999)]. London Review of Books, 28 October 1999, 30-31.

‘Old Irish feda (gen. fedot): A “Puzzling” Form in the Cambrai Homily and its Implications for the Apocope of /i/’, in Studia Celtica et Indogermanica: Festschrift für Wolfgang Meid zum 70. Geburtstag, edited by Peter Anreiter and Erzsébet Jerem, Archaeolingua, 10 (Budapest, 1999), pp. 471-74. 

Review: An Age of Tyrants: Britain and the Britons A.D. 400-600 by Christopher A. Snyder (Stroud: Sutton Publishing, 1998). Times Literary Supplement, 31 December 1999, p. 31.

‘The DEVORIGI Inscription from Capel Eithin, Llanfihangel Ysgeifiog,  Anglesey’, Transactions of the Anglesey Antiquarian Society and Field Club, 1999,pp. 146-49 and 161-66.

‘Preface’ and ‘Degrees of Celticity in Ptolemy’s Names: Examples from Wales’, in PTOLEMY: Towards a Linguistic Atlas of the Earliest Celtic Place-Names of Europe. Papers from a Workshop Sponsored by the British Academy, in the Department of Welsh, University of Wales, Aberystwyth, 11-12 April 1999, edited by David N. Parsons and Patrick Sims-Williams (Aberystwyth: CMCS, 2000), pp. vii-viii and 1-15.

Review: Daniel Huws, Medieval Welsh Manuscripts (Cardiff: University of Wales Press. 2000). Times Literary Supplement, 11 May 2001, p. 32.

‘Clas Beuno and the Four Branches of the Mabinogi’, in 150 Jahre “Mabinogion”: Deutsch-walisische Kulturbeziehungen, edited by Bernhard Maier and Stefan Zimmer, with Christiane Batke, Buchreihe der Zeitschrift für celtische Philologie, 19 (Tübingen, 2001), pp. 111-27.

‘The Dearth of Welsh Linguists’, Planet, 142 (April/May 2002), 95.

The Celtic Inscriptions of Britain: Phonology and Chronology, c. 400-1200, Publications of the Philological Society, 37 (Oxford: Blackwell, 2003; repr. 2004), xii + 464 pp.

‘The Five Languages of Wales in the Pre-Norman Inscriptions’, Cambrian Medieval Celtic Studies, 44 (Winter 2002), 1-36.

Review: James E. Fraser,  The Battle of Dunnichen, 685 (Stroud: Tempus. 2002). Times Literary Supplement, 30 May 2003, p. 30.

Review: Wendy Davies, James Graham-Campbell, Mark Handley, Paul Kershaw, John T. Koch, Gwenaël Le Duc, and Kris Lockyear, The Inscriptions of Early Medieval Brittany: Les Inscriptions de la Bretagne du haut moyen âge (Oakville, CT & Aberystwyth: Celtic Studies Publications, 2000). Cambrian Medieval Celtic Studies, 45 (Summer 2003), 78-80.

Entries in The Oxford Dictionary of National Biography  (Oxford, 2004) on: Beuno; Burginda; Ecgburg; Kings of the Hwicce; Milred;  Oftfor;  Putta.

Review of: John V. Day, Indo-European Origins:  The Anthropological Evidence (Washington D.C.: The Institute for the Study of Man, 2001). Kratylos, 49 (2004), 39-43.

‘The Importance of Being Patrick’, in A Companion in Linguistics: A Festschrift for Anders Ahlqvist on the Occasion of his Sixtieth Birthday, edited by Bernadette Smelik, Rijcklof Hofman, Camiel Hamans, and David Cram (Nijmegen: Stichting Uitgeverij de Keltische Draak, 2005), pp. 26-35.

‘Person-Switching in Celtic Panegyric: Figure or Fault?’, in Heroic Poets and Poetic Heroes in Celtic Tradition: A Festschrift for Patrick K. Ford, edited by Joseph Falaky Nagy and Leslie Ellen Jones, CSANA Year-Book, 3/4 (Dublin: Four Courts Press, 2005), pp. 315-26.

‘Medieval Irish Literary Theory and Criticism: 1. Poetic Theory’, in The Cambridge History of Literary Criticism, II, The Middle Ages, edited by Alastair Minnis and Ian Johnson (Cambridge: Cambridge University Press, 2005), pp. 291-301 and 754-58.

‘A Recension of Boniface’s Letter to Eadburg about the Monk of Wenlock’s Vision’, in Latin Learning and English Lore: Studies in Anglo-Saxon Literature for Michael Lapidge, I, edited by Katherine O’Brien O’Keeffe and Andy Orchard (Toronto: University of Toronto Press, 2005), pp. 194-214.

‘Welsh Iâl, Gaulish Names in Ial- and -ialo-, and the God Ialonus’, Cambrian Medieval Celtic Studies, 49 (Summer 2005), 57-72.

(Editor) New Approaches to Celtic Place-Names in Ptolemy’s Geography, edited by Javier de Hoz, Eugenio R. Luján, and Patrick Sims-Williams (Madrid: Ediciones Clásicas, 2005), 287pp.

‘Measuring Celticity from Wales to the Orient’, in New Approaches to Celtic Place-Names in Ptolemy’s Geography, edited by Javier de Hoz, Eugenio R. Luján, and Patrick Sims-Williams (Madrid: Ediciones Clásicas, 2005), pp. 267-87.

‘A New Brittonic Gloss on Boethius: ud rocashaas’, Cambrian Medieval Celtic Studies, 50 (Winter 2005), 77-86.

[unsigned] ‘Indices to CMCS, 1-50 (1981-2005)’, Cambrian Medieval Celtic Studies, 50 (Winter 2005), 97-125.

Ancient Celtic Place-Names in Europe and Asia Minor, Publications of the Philological Society, 39 (Oxford: Blackwell, 2006), xiii + 406 pp., 69 maps.

The Iron House in Ireland, H. M. Chadwick Memorial Lectures, 16 (Cambridge: Department of Anglo-Saxon, Norse, and Celtic, University of Cambridge, 2006), 31pp.

(Editor) Additions to Alfred Holder’s Celtic Thesaurus by Georges Cousin  together with an Electronically Searchable Version of Holder’s Headwords  by Llinos Dafis and Ashwin Gohil  and Indexes to Joshua Whatmough’s ‘The Dialects of Ancient Gaul’  by Xavier Delamarre and G. R. Isaac (Aberystwyth: CMCS, 2006), 146 pp. + CD-ROM.

(Joint-Editor, with Gruffydd Aled Williams)Crossing Boundaries / Croesi Ffiniau: Trafodion y XIIfed Gyngres Astudiaethau Celtaidd Ryngwladol 24-30 Awst 2003, Prifysgol Cymru, Aberystwyth / Proceedings of the XIIth International Congress of Celtic Studies 24-30 August 2003, University of Wales, Aberystwyth, Cambrian Medieval Celtic Studies, 53/54 (Aberystwyth: CMCS, 2007), viii + 160 pp.

Review: Sioned Davies (transl.), The Mabinogion (Oxford: Oxford University Press, 2007), The Times Literary Supplement,6 July 2007, 10-11.

(with Marilynne E. Raybould) The Geography of Celtic Personal Names in the Latin Inscriptions of the Roman Empire (Aberystwyth: CMCS, 2007), iv + 210 pp.

(with Marilynne E. Raybould) A Corpus of Latin Inscriptions of the Roman Empire Containing Celtic Personal Names (Aberystwyth: CMCS, 2007), ix + 283 pp.

‘Common Celtic, Gallo-Brittonic and Insular Celtic’, in Gaulois et Celtique Continental, edited by Pierre-Yves Lambert and Georges-Jean Pinault (Geneva: Droz, 2007), pp. 309-54.

Studies on Celtic Languages before the Year 1000 (Aberystwyth: CMCS, 2007), ix + 253 pp.

Linguistic sections of A Corpus of Early Medieval Inscribed Stones and Stone Sculpture in Wales, vols I-II, edited by Mark Redknap and John Lewis (vol. I) and Nancy Edwards (Vol. II) (Cardiff: University of Wales Press, 2007).

‘Comparing the Distribution of Celtic Personal Names with that of Celtic Place-Names’, in Celtic and Other Languages in Ancient Europe, edited by Juan Luis García Alonso (Salamanca: Ediciones Universidad de Salamanca, 2008), pp. 29-51.

‘Kel’tomanija i Kel’toskepticizm’, Neprikosnovennyj zapas [Moscow], 57 (2008), 179-91. 

‘The Problem of Spirantization and Nasalization in Brittonic Celtic’, in Evidence and Counter-Evidence: Essays in honour of  Frederik Kortlandt, I, Baltic and Indo-European Linguistics, edited by Alexander Lubotsky, Jos Schaeden, and Jeroen Wiedenhof, Studies in Slavic and General Linguistics, 32 (Amsterdam and New York: Rodopi, 2008), pp. 509-25.

‘Early Inscriptions and their Language’ and ‘Later Inscriptions and the Use of Languages’, in Hidden Histories: Discovering the Heritage of Wales, edited by Peter Wakelin and Ralph A. Griffiths (Aberystwyth: Royal Commission of the Ancient and Historical Monuments of Wales, 2008), pp. 102-3 and 116-17. Translated as: ‘Arysgrifau Cynnar a’u Hiaith’ and ‘Arysgrifau Diweddarach a’r Ieithoedd Arnynt, in Trysorau Cudd: Darganfod Treftadaeth Cymru, edited by Peter Wakelin and Ralph A. Griffiths (Aberystwyth: Comisiwn Brenhinol Henebion Cymru, 2008), pp. 102-3 and 116-17.

‘The God Ialonos in Britain and Gaul’, in Continuity and Innovation in Religion in the Roman West, II, edited by R. Haeussler and A. C. King, Journal of Roman Archaeology, Supplementary Series, 67, Volume 2 (Portsmouth, Rhode Island 2008), pp. 83-85.

‘Celto-Iranica’, in Exegisti Monumenta: Festschrift in honour of Nicholas Sims-Williams, edited by Werner Sundermann, Almut Hintze, and François de Blois, Iranica, 17 (Wiesbaden: Harrassowitz, 2009), pp. 463-67.

(with Marilynne E. Raybould) Introduction and Supplement to the Corpus of Latin Inscriptions of the Roman Empire Containing Celtic Personal Names (Aberystwyth: CMCS Publications, 2009), viii + 344 pp., 16 maps.

‘The European Reference Index for the Humanities (ERIH)—Editorial’, Cambrian Medieval Celtic Studies 58 (Winter 2009), 1-8.

‘The Spread of “Sandhi ­h-” in Thirteenth-Century Welsh’, Transactions of the Philological Society, 108 (2010), 41-52.

Review of Simon Young, The Celtic Revolution: In Search of Two Thousand Forgotten Years That Changed Our World (London: Gibson Square, 2009). Times Literary Supplement, 26 March 2010, p. 32.

Rhyddiaith Gymraeg o Lawysgrifau’r 13eg Ganrif Fersiwn 1.0, trawsysgrifiwyd gan G. R. Isaac a Simon Rodway ac aildrefnwyd gan Silva Nurmio, Kit Kapphahn a Patrick Sims-Williams / A searchable version of all the Welsh prose in 13th-century manuscripts, transcribed by G. R. Isaac & Simon Rodway and reformatted by Silva Nurmio, Kit Kapphahn & Patrick Sims-Williams(Aberystwyth: Prifysgol Aberystwyth/ Aberystwyth University, 2010) 

Irish Influence on Medieval Welsh Literature (Oxford: Oxford University Press, 2011 [November 2010]). xii + 425 pp.

‘Shrewsbury School MS 7 and the Breton Lays’, Cambrian Medieval Celtic Studies, 60 (Winter 2010), 39-80.

Tochmarc Becfhola: A “Peculiar Confused Tale”?’, CSANA Year-Book, 8-9: Proceedings of the Celtic Studies Association of North America (Hamilton, NY: Colgate University Press, 2011), pp. 228-34.

‘Celto-Etruscan Speculations’, in A Greek Man in the Iberian Street: Papers in Linguistics and Epigraphy in Honour ofJavier de Hoz, edited by Eugenio R. Luján and Juan Luis García Alonso, Innsbrucker Beiträge zur Sprachwissenschaft (Innsbruck, 2011), pp. 275-84. 

Rhai Addasiadau Cymraeg Canol o Sieffre o Fynwy, Darlith Goffa J. E. Caerwyn a Gwen Williams (Aberystwyth: Canolfan Uwchefrydiau Cymreig a Cheltaidd Prifysgol Cymru, 2011). 58pp.

‘Variation in Middle Welsh Conjugated Prepositions: Chronology, Register, and Dialect’, Transactions of the Philological Society, 111(2013), 1-50 [first published online: 28 May 2012]

‘Bronze- and Iron-Age Celtic-speakers: what don’t we know, what can’t we know, and what could we know? Language, genetics and archaeology in the twenty-first century’, in Antiquaries Journal, 92 (2012), 427-49; first published online: 15 August 2012 

‘Celtic Civilization: Continuity or Coincidence?’, Cambrian Medieval Celtic Studies, 64 (Winter 2012), 1-45.

‘Celtic Personal Names’, in Personal Names in the Western Roman World: Proceedings of a Workshop Convened by Torsten Meissner, José Luis García Ramón and Paolo Poccetti, held at Pembroke College, Cambridge, 16-18 September 2011, edited by Torsten Meissner, Studies in Classical and Comparative Onomastics, 1 (Berlin: Curach Bhán, 2012), pp. 151-66.

Rhyddiaith Gymraeg o Lawysgrifau’r 13eg Ganrif: Fersiwn 2.0, trawsysgrifiwyd gan G. R. Isaac a Simon Rodway ac aildrefnwyd gan Silva Nurmio, Kit Kapphahn a Patrick Sims-Williams / A searchable version of all the Welsh prose in 13th-century manuscript: Version 2.00, transcribed by G. R. Isaac & Simon Rodway and reformatted by Silva Nurmio, Kit Kapphahn & Patrick Sims-Williams(Aberystwyth: Prifysgol Aberystwyth/ Aberystwyth University, 2013) [July 2013]

Linguistic sections of A Corpus of Early Medieval Inscribed Stones and Stone Sculpture in Wales, vol. III, edited by Nancy Edwards (Cardiff: University of Wales Press, 2013).

‘Post-Celtoscepticism: A Personal View’, in Saltair Saíochta, Sanasaíochta agus Seanchais: A Festschrift for Gearóid Mac Eoin, edited by Dónaill Ó Baoill, Donncha Ó hAodha and Nollaig Ó Muraíle (Dublin: Four Courts Press, 2013), pp. 422-28.

‘Labours Lost’: review of Graham Robb: The Ancient Paths: Discovering the Lost Map of Celtic Europe (London: Picador, 2013). Times Literary Supplement, no. 5773, 22 November 2013, p. 25. + Letter ‘Á “The Ancient Paths”’, ibid., no. 5775, 6 December 2013, p. 6.

Review of Beyond the Gododdin: Dark Age Scotland in Medieval Wales, The Proceedings of a Day Conference held on 19 February 2005, edited by Alex Woolf. St John’s House Papers, 13 (St Andrews: Committee for Dark Age Studies, University of St Andrews, 2013). Cambrian Medieval Celtic Studies, 66 (Winter 2013), 85-88.

‘The Celtic Composition Vowels -o- and -io-’, in Continental Celtic Word Formation: The Onomastic Data, edited by Juan Luis García Alonso (Salamanca: Ediciones Universidad de Salamanca, 2013), pp. 37-50.