Other Events and Attributes:

• Appointments / Titles: King of Ceredigion
• FSID: LD3L-WNL

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.

Seisyll married ap Clydog, N.N. in 719 in Ceredigion, Wales. N.N. was born in 705 in Ceredigion, Wales; died in DECEASED in Ceredigion, Wales. [Group Sheet] [Family Chart]

Other Events and Attributes:

• Appointments / Titles: King of Seisyllwg and Ceredigion
• FSID: LDQ1-2T4

Notes:

BIO: from British Kings and Queens (Mike Ashley) p 132
Arthgen ap Seisyll, Ceregigion and Seisyllwg, ?-807
Arthgen inherited the newly expanded kingdom of Seisyllwg from his father, though it may have been Arthgen who gave it its new name in honour of his father. He was still recorded as king of Ceredigion, however, at the time of his death.

Arthwyr married verch Cadifor, Morfyl in 752 in Ceredigion, Wales. Morfyl (daughter of Cadifor and N.N., Mrs. N.N.) was born in 732 in Ceredigion, Wales; died in 755 in Wales. [Group Sheet] [Family Chart]

Other Events and Attributes:

• FSID: LD3L-7M9
• Appointments / Titles: 807; King of Ceredigion
• Appointments / Titles: 807, Seisyllwg, Ceredigion, Wales; King of Seisyllwg

Notes:

Dyfnwallon was the son of Arthgen. His reign commenced in 807, but it is not certain how long he ruled and he may have survived into the 830s. At this time Merfyn Frych of Gwynedd was beginning his territorial expansion and Dyfnwallon must have had problems in retaining his independence. He was succeeded by his son Meurig.
BIO: from British Kings and Queens (Mike Ashley) p 132

Family/Spouse: ap Arthwyr, Princess N.N.. N.N. was born in 758 in Ceredigion, Wales; died in 780 in Somme, Picardie, France. [Group Sheet] [Family Chart]

Other Events and Attributes:

• FSID: G4ZC-SB2

Notes:

Parentage
Meurug was the son of Llywarch, King of Ceredigion and his wife, whose name is not known.

«b»Marriage«/b»
The name of Meurug's wife is unknown.

«b»Issue
Meurug & his wife had [two] children:«/b»

1.) Gwgawn drowned in the river Llychwr, Gower in the year 870/71]. He was king of Ceredigion. The Chronicle of the Princes of Wales records that "Gwgawn son of Meurug king of Ceredigion was drowned" in 871. The Gwentian Chronicle records that "Gwgan son of Morydd son of Llywarch Llwyd, king of Ceredigion was drowned in crossing the river Llychwr in Gower, to drive the black pagans out of that country" in 870.

2.) Angharad. Her parentage and marriage are recorded in a manuscript now at Jesus College. Angharad married Rhodri ap Merfyn "Mawr/the Great", son of Merfyn "Frych/the Freckled" ap Gwriad King of Gwynedd & his wife Nest of Powys (-killed Anglesey 878).

Family/Spouse: N.N., Lady N.N.. N.N. was born in 782 in Ceredigion, Wales; died in DECEASED in Wales. [Group Sheet] [Family Chart]