Cadell ap Rhodri Mawr King of Seisyllwg ^{1 2}

  Research Notes:

From A History of Wales, p. 83:

"According to Asser, the rulers of Dyfed and Brycheiniog feared the pwer of the sons of Rhodri, while the rulers of Gwent and Glywysing were threated by Aethelred, earl of Mercia. When Alfred came to the throne in 871, the whole of England, apart from the southern rim of Wessex, was in the hands of the Danes but, as a result of his successes against them, Alfred came to enjoy great power and renown. Asser states that the smaller rulers of Wales asked him for his patronage and that Anarawd ap Rhodri, king of Gwynedd and Poweys, followed their example, abandoning his alliance with the Danish kingdom of York. It is likely that his brother Cade3ll, ruler of Seisyllwg, did the same, and thus the king of Wessex became overlord of the whole of Wales. .. The recognition by Welsh rulers that the king of England had claims upon them would be a central fact in the subsequent political history of Wales."

Cadell married Rheingar. (Rheingar was born circa 865 in Carmarthenshire, Wales.)