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.
Hywel Dda, sometimes anglicised as Howell the Good, or Hywel ap Cadell was a king of Deheubarth who eventually came to rule most of Wales. He became the sole king of Seisyllwg in 920 and shortly thereafter established Deheubarth, and proceeded to gain control over the entire country from Prestatyn to Pembroke. As a descendant of Rhodri Mawr through his father Cadell, Hywel was a member of the Dinefwr branch of the dynasty. He was recorded as King of the Britons in the Annales Cambriæ and the Annals of Ulster.
Cunedda ap Edern or Cunedda Wledig was an important early Welsh leader, and the progenitor of the royal dynasty of Gwynedd.
Myrddin Wyllt is a figure in medieval Welsh legend. In Middle Welsh poetry he is accounted a chief bard, the speaker of several poems in The Black Book of Carmarthen and The Red Book of Hergest. He is called Wyllt—"the Wild"—by Elis Gruffydd, and elsewhere Myrddin Emrys ("Ambrosius"), Merlinus Caledonensis or Merlin Sylvestris("of the woods").
Peredur is the name of a number of men from the boundaries of history and legend in sub-Roman Britain. The Peredur who is most familiar to a modern audience is the character who made his entrance as a knight in the Arthurian world of Middle Welsh prose literature.
Iago ap Beli was King of Gwynedd. Little is known of him or his kingdom from this early era, with only a few anecdotal mentions of him in historical documents.
Idwal Iwrch, or Idwal ap Cadwaladr, is a figure in the genealogies of the kings of Gwynedd. He was the son of King Cadwaladr ap Cadwallon and the father of King Rhodri Molwynog. William Wynne places Cynan Dindaethwy as his son, but other sources have Cynan as the son of Rhodri. The records of this era are scanty, and Idwal's name appears only in the pedigrees of later kings and in a prophecy found in two 14th-century Welsh manuscripts, which says that he will succeed his father Cadwaladr as king.
Rhodri Molwynog, also known as Rhodri ap Idwal was an 8th-century king of Gwynedd. He was listed as a King of the Britons by the Annals of Wales.
Caradog ap Meirion was an 8th-century king of Gwynedd in northwest Wales.
Seisyllwg was a petty kingdom of medieval Wales. It is unclear when it emerged as a distinct unit, but according to later sources it consisted of the former Kingdom of Ceredigion plus the region known as Ystrad Tywi. Thus it covered the modern county of Ceredigion, part of Carmarthenshire, and the Gower Peninsula. It is evidently named after Seisyll, king of Ceredigion in the 7th or early 8th century, but it is unknown if he was directly responsible for its establishment. In the 10th century Seisyllwg became the centre of power for Hywel Dda, who came to rule most of Wales. In 920 Hywel merged Seisyllwg with the Kingdom of Dyfed to form the new kingdom of Deheubarth.
Cynan Dindaethwy or Cynan ap Rhodri was a king of Gwynedd in Wales in the Early Middle Ages. Cynan was the son of Rhodri Molwynog and ascended to the throne of Gwynedd upon the death of King Caradog ap Meirion in 798. His epithet refers to the commote of Dindaethwy in the cantref Rhosyr. Unlike later kings of Gwynedd, usually resident at Aberffraw in western Anglesey, Cynan maintained his court at Llanfaes on the southeastern coast. Cynan's reign was marked by a destructive dynastic power struggle with a rival named Hywel, usually supposed to be his brother.
Hywel ap Rhodri Molwynog as he was improperly called due to lack of knowledge of the genealogies by men like John Edward Lloyd, but in fact was Hywel ap Caradog was King of Gwynedd. He rose to power following a destructive dynastic struggle in which he deposed his cousin, King Cynan Dindaethwy ap Rhodri. During Hywel's reign Gwynedd's power was largely confined to Anglesey. It was a time of substantial territorial loss to Mercia.
Brycheiniog was an independent kingdom in South Wales in the Early Middle Ages. It often acted as a buffer state between England to the east and the powerful south Welsh kingdom of Deheubarth to the west. It was conquered and pacified by the Normans between 1088 and 1095, though it remained Welsh in character. It was transformed into the Lordship of Brecknock and later formed the southern and larger part of the historic county of Brecknockshire. To its south was the Kingdom of Morgannwg.
Rhain ap Cadwgan was an 8th-century king of Dyfed and Brycheiniog in Wales of the Early Middle Ages. He succeeded his father Cadwgan, who succeeded his father Caten ap Cloten.
Ystrad Tywi is a region of southwest Wales situated on the both banks of the River Tywi. Although Ystrad Tywi was never a kingdom itself, it was historically a valuable territory and was fought over by the various kings of Dyfed, Deheubarth, Seisyllwg, Gwynedd, Morgannwg and the Normans.
The House of Aberffraw is a historiographical and genealogical term historians use to illustrate the clear line of succession from Rhodri the Great of Wales through his eldest son Anarawd.
The House of Mathrafal began as a cadet branch of the House of Dinefwr, taking their name from Mathrafal Castle, their principal seat and effective capital. Although their fortunes rose and fell over the generations, they are primarily remembered as kings of Powys in central Wales.
The Harleian genealogies are a collection of Old Welsh genealogies preserved in British Library, Harley MS 3859. Part of the Harleian Library, the manuscript, which also contains the Annales Cambriae and a version of the Historia Brittonum, has been dated to c. 1100, although a date of c.1200 is also possible. Since the genealogies begin with the paternal and maternal pedigrees of Owain ap Hywel Dda, the material was probably compiled during his reign. The collection also traces the lineages of less prominent rulers of Wales and the Hen Ogledd. Some of the genealogies reappear in the genealogies from Jesus College MS 20.
Aeron was a kingdom of the Brythonic-speaking Hen Ogledd, presumed to have been located in the region of the River Ayr in what is now southwestern Scotland. It existed during the post-Roman era, perhaps earlier, and disappeared before or during the 7th-century conquest of the region by the ascendant Kingdom of Northumbria.
Arthen son of Seisyll was a king of Ceredigion in Wales of the Early Middle Ages. His father was Seisyll ap Clydog.
Lloyd history of Wales.