ap Clydog, King Seisyll

692 - 740  (48 years)

• Name	ap Clydog, Seisyll  [1, 2, 3, 4, 5, 6, 7, 8]
  Title	King
  Birth	692	Ceredigion, Wales   [1, 2, 3, 5, 6, 7, 8]
  Gender	Male
  Appointments / Titles	King of Ceredigion  [1, 2, 3, 5, 6, 8]
  FSID	LD3L-WNL  [1, 2, 3, 5, 6, 8]
  Death	740	Ceredigion, Wales   [1, 2, 3, 5, 6, 8]
  Burial	740	Ceredigion, Wales   [1, 2, 3, 5, 6, 8]
  Person ID	I33493	The Thoma Family
  Last Modified	20 Sep 2023

  
  

  Father	ap Arthglwys, King Clydog,   b. 665, Cardigan, Cardiganshire, Wales d. 730, Wales (Age 65 years)
  Relationship	natural
  Family ID	F13020	Group Sheet  |  Family Chart

  
  

  Family	ap Clydog, N.N.,   b. 705, Ceredigion, Wales d. DECEASED, Ceredigion, Wales
  Marriage	719	Ceredigion, Wales   [1, 2, 3, 5, 6, 8]
  Children	1. ap Seisyll, King Arthwyr,   b. 720, Ceredigion, Wales d. 807, Ceredigion, Wales (Age 87 years)  [natural]
  Family ID	F13018	Group Sheet  |  Family Chart
  Last Modified	20 Sep 2023

  
  

• Event Map

  Birth - 692 - Ceredigion, Wales Marriage - 719 - Ceredigion, Wales Death - 740 - Ceredigion, Wales Burial - 740 - Ceredigion, Wales  = Link to Google Earth

  
  

• Notes

  Seisyll ap Clydog was King of Ceredigion in Wales some time in the late 7th or early 8th century. He gave his name to the later kingdom of Seisyllwg, which consisted of Ceredigion plus the region known as Ystrad Tywi; as such he was possibly the king responsible for the expansion. However, there is no contemporary evidence of this, and almost nothing is known of his life or reign. Seisyll appears in the Harleian genealogies for the kings of Ceredigion.[1] Here, he is named as the son of Clydog or Clitauc Artgloys, and is the sixth in descent from Ceredig, the traditional founder of Ceredigion. The Harleian also names him as the father of Arthgen, presumably the King of Ceredigion whom the Annales Cambriae record as dying in 807.[2] Seisyll's name appears to derive from the notional Late Latin *Saxillus, which comes from the same root as the Welsh sais, meaning Saxon or Englishman.[3] Seisyll ap Clydog is generally taken to be the Seisyll for whom Seisyllwg was named.[3] As such, historians such as John Edward Lloyd and Egerton Phillimore believed that he was the king who founded that kingdom.[4] However, contemporary sources continue to use the name Ceredigion for the realm of Seisyll and his successors.[3] As such, "Seisyllwg" may represent a substantially later political development. He gave his name to the region known as Ystrad Tywi; as such he was possibly the king responsible for the expansion. However, there is no contemporary evidence of this, and almost nothing is known of his life or reign.

  
  

• Sources

  [S880] WALES: Welsh Genealogies, AD 300-1400 by Peter C Bartrum. https://www.familysearch.org/search/catalog/102699?availability=Family%20History%20Library [S789] WORLD: Family Search, Family Tree. https://www.familysearch.org/search/tree/name [S2644] WORLD: Wikiwand. https://www.wikiwand.com/en/ [S2702] WALES: Ancient Wales Studies. http://www.ancientwalesstudies.org/ [S791] WORLD: Ancestry Family Trees. https://www.ancestry.com/search/categories/42/ [S2788] WALES: Dictionary of Welsh Biography down to 1940; John Edward Lloyd & R T Jenkins. https://www.worldcat.org/title/3635371 [S2434] WORLD: Rootsweb: World Connect. https://wc.rootsweb.com/search [S2790] ENGLAND: Early British Kingdoms. http://www.earlybritishkingdoms.com/gene/coel.html