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Besides numerous research papers on the philology of many Celtic languages, he is the author of Medieval Welsh Literature (1997)[6] and The Origins of the "Four Branches of the Mabinogi" (2009). He is also co-author with Richard Coates of Celtic Voices, English Places (2000).[citation needed]
Breeze has written about Mabinogi studies, and The Mabinogion research, especially addressing historical and political parallels.[7] In 1997 he published the controversial "Did a woman write the Four Branches of the Mabinogi?",[8][9] proposing a woman composer for this leading literary work of British/ Welsh heritage. Breeze's theory rests on the unusual lack of warlike or fighting heroics compared to preceding literature; the high quantity of material on mothering, besides complex, in-depth portraits of Mabinogi women.[10] This much has been supported or tolerated by some scholars, but there has been discussion regarding Breeze's preferred candidate Gwenllian ferch Gruffydd. Since the 1997 article, Breeze has provided further publications on this topic.[7]
In 2015, he published "The Historical Arthur and Sixth-Century Scotland",[11] which locates King Arthur's battles from the 9th-century Historia Brittonum, placing them all in Scotland and Northern England, with the exception of Mount Badon in the year 493, located at a hillfort east of Braydon Forest, Wiltshire, but having nothing to do with Arthur. Using these identifications, he suggested that Arthur was a Briton from the Kingdom of Strathclyde who fought other Britons, rather than Anglo-Saxons.[12] Other scholars have questioned his findings, which they consider are based on coincidental resemblances between place-names.[13][14]Nicholas Higham comments that it is difficult to justify identifying Arthur as the leader in northern battles listed in the Historia Brittonum while rejecting the implication in the same work that they were fought against Anglo-Saxons, and that there is no textual justification for separating Badon from the other battles.[15]
Breeze's British Battles 493–937: Mount Badon to Brunanburh was published in 2020 by Anthem Press. As well as reaffirming the Wiltshire site for the 493 battle, it gives new locations for various early conflicts. Amongst them are those of Arthur in 536–7 in southern Scotland and northern England; Degsastan in 603 near Dawyck, on the River Tweed, Scottish Borders; the Battle of Maserfield in 642 at Forden, Powys (and not Oswestry, Shropshire); and Brunanburh in 937 on the River Browney near Lanchester, County Durham (and not Bromborough in Cheshire/Merseyside). This work aims to provide a blueprint for locating a range of battles fought during this early period of British history.
1997 Medieval Welsh Literature, Four Courts Press (ISBN1-85182-229-1)
2000 (with Richard Coates; including a contribution by David Horovitz) Celtic Voices, English Places: Studies of the Celtic Impact on Place-Names in England, Stamford: Shaun Tyas; (ISBN1 900289 41 5)
↑'Appendix V. Candidates who Took the Anglo-Saxon, Norse and Celtic Tripos between 1900 and 1999', in H. M. Chadwick and the Study of Anglo-Saxon, Norse and Celtic in Cambridge, ed. by Michael Lapidge [=Cambrian Medieval Celtic Studies, 69–70] (Aberystwyth: Department of Welsh, Aberystwyth University, 2015), pp. 257–66 (p. 262). ISBN978-0-9557182-9-8.
↑There is an interesting study of Mabinogi women, with conclusions very different from those reached by Breeze, in Roberta Valente's ‘"Merched y Mabinogi": Women and the Thematic Structure of the Four Branches’ (unpub. PhD thesis, Cornell University, 1986)
↑Andrew Breeze, "The Historical Arthur and Sixth-Century Scotland", Northern History52:2:158-181 (2015)