Cadfan ap Iago

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Cadfan ap Iago (c. 569 – c. 625) was King of Gwynedd (reigned c. 616 – c. 625). Little is known of the history of Gwynedd from this period, and information about Cadfan and his reign is minimal.

The historical person is known only from his appearance in royal genealogies, from his grant to Saint Beuno for the monastery at Clynnog Fawr, and from his inscribed gravestone in Llangadwaladr church.

Cadfan was the son and successor of King Iago ap Beli, and is listed in the royal genealogies of the Harleian genealogies and in Jesus College MS. 20.[1][a][2][b] Cadfan came to the throne near the time of the Battle of Chester (Welsh: Gwaith Caerlleon) in 616, in which the Northumbrians under Æthelfrith decisively defeated the neighboring Welsh Kingdom of Powys and then massacred the monks of Bangor Is Coed. However, there is no evidence that Gwynedd had any part in the battle,[3] so Cadfan's accession at that time appears to be no more than coincidence.

Cadfan was succeeded as king by his son, Cadwallon ap Cadfan.


Cadfan's gravestone is at Llangadwaladr (English: Cadwaladr's Church) on Anglesey, a short distance from the ancient llys (English: royal court) of the kings of Gwynedd, and reputed to be their royal burial ground. The inscription refers to him as sapientisimus (English: most wise), and as this term is historically used for ecclesiastics, it suggests that at some point, Cadfan had resigned as king to live a consecrated life.[4][c]

The Catamanus stone in Llangadwaladr church, 2018
King Cadfan's gravestone in Llangadwaladr church. The inscription reads "Catamanus rex sapientisimus opinatisimus omnium regum" (English: King Cadfan, most wise and renowned of all kings).[5]

Saint Beuno[edit]

Saint Beuno and the monastery at Clynnog Fawr are often cited in conjunction with Cadfan. An 1828 article by P. B. Williams in the Cymmrodorion cited a manuscript stating that a local prince named 'Gwytheint' gave Clynnog Fawr to God and Saint Beuno, who was then Abbot at the monastery at Clynnog, and that the donation was free from taxes and obligations forever. It goes on to say that Beuno founded a convent at Clynnog in 616, and that Cadfan was Beuno's great patron, promising him extensive lands. The promise was carried out by Cadfan's son, King Cadwallon, and that Cadwallon was given a golden sceptre worth 60 cows as a token of acknowledgment.[6][d][7] (Life of Saint Beino) (Rees was the editor of the 1828 Cymmrodorion that published P. B. Williams' account.)

There are minor variations of these accounts, sometimes with the details rearranged, such as in Rice Rees' 1836 Essay on the Welsh Saints, where he says that Cadfan (rather than his son Cadwallon) was given the golden sceptre by Beuno.[8]

Fictionalization by and after Geoffrey of Monmouth[edit]

The largely fictional stories of ancient Britain written by Geoffrey of Monmouth use the names of many historical personages as characters, and the use of these names is a literary convenience made in order to advance the plot of Geoffrey's stories. One of these stories uses the names of Cadfan and other contemporary people, telling of how a certain Edwin spent his exiled youth at the court of King Cadfan, growing up alongside Cadfan's son, the future King Cadwallon. There is no historical basis for this story, as is readily acknowledged in the preface of works on the subject.[9]

Nevertheless, a "traditional" story arose blending Geoffrey's fiction with known history, implying that the future King Edwin of Northumbria had actually spent his youth at the court of King Cadfan, growing up alongside Cadfan's son, the future King Cadwallon. In point of fact, Cadwallon and Edwin were enemies with no known youthful connections: King Edwin invaded Gwynedd and drove King Cadwallon into exile, and it would be Cadwallon, in alliance with Penda of Mercia, who would ultimately defeat and kill Edwin in 633 at the Battle of Hatfield Chase (Welsh: Gwaith Meigen). The story that they had spent an idyllic youth together may have had a romantic appeal.

What is known from history is that in 588 King Ælla of Deira died, and Æthelfrith of Bernicia took the opportunity to invade and conquer Deira, driving Ælla's 3-year old infant son, the future Edwin of Northumbria, into exile. Edwin would eventually ally himself with Rædwald of East Anglia in 616, defeating and killing Æthelfrith and becoming one of Northumbria's most successful kings. Edwin's life in exile is unknown, and there is no historical basis for placing him at the court of King Cadfan.[10]

See also[edit]


  1. ^ the pedigree is given as: ... map Rotri map mermin map etthil merch cinnan map rotri map Intguaul map Catgualart map Catgollaun map Catman map Iacob map Beli map Run ..., and from there back to Cunedda and his ancestors.
  2. ^ Phillimore, The pedigree is given as ... Cynan tintaeth6y. M. Rodri mol6yna6c. M. Idwal I6rch. M. Kadwaladyr vendigeit. M. Katwalla6n. M. Kad6ga6n. M. Iago. M. Beli. M. Run hir. M. Maelg6n g6yned ..., and from there back to Cunedda.
  3. ^ In the footnote. Sapientisimus here applied to him means simply, in the Latin of the period, a 'highly learned man', and presumably therefore an ecclesiastic. Compare to the epithet of Gildas (Gildas Sapiens), implying clerical status, not natural wisdom.
  4. ^ A consistent version is given in W. J. Rees' 1853 Lives of the Cambro-British Saints


  1. ^ Phillimore 1888, pp. 169–170.
  2. ^ Phillimore 1887, pp. 87.
  3. ^ Lloyd 1911:181, A History of Wales, Vol. I
  4. ^ Chadwick 1959, pp. 156.
  5. ^ Lloyd 1911:182, A History of Wales, Vol. I
  6. ^ Williams 1828:236, Clynog Vawr
  7. ^ Rees 1853, pp. 300.
  8. ^ Rees 1836:268, Essay on the Welsh Saints
  9. ^ Menzies, Louisa L. J. (1864), "The Legend of Cadwallon", Legendary Tales of the Ancient Britons, Rehearsed from the early Chronicles of Geoffrey of Monmouth, London: John Russell Smith, pp. 167–190
  10. ^ Hunt, William (1899), Stephens, W. R. W.; Hunt, William (eds.), The English Church: From Its Foundation to the Norman Conquest (597 – 1066), vol. I, London: Macmillan and Co. (published 1901), p. 52


Regnal titles
Preceded by King of Gwynedd
c. 615 – c. 625
Succeeded by
Legendary titles
Title last held by
King of Britain Succeeded by