list of legendary kings of britain - Aftermath
After the death of Cadwallader, the kings of the Brythons were reduced to such a small domain that they ceased to be kings of the whole Brythonic-speaking area. Two of his relatives, Yvor and Yni, led the exiles back from Brittany, but were unable to re-establish an united kingship. The Anglo-Saxon invaders ruled the south-eastern part of the island of Great Britain after that point in time under the Bretwaldas and later the kings of England.

The heirs to the Celtic-British throne continued through the Welsh kings of Gwynedd until that line was forced to submit itself to the English in the 13th century. Princes and lords of Gwynedd ruled until the reign of Dafydd III, who ruled from 1282 to 1283. His death marked the end of the house of Brutus. Owen Tudor, grandfather of Henry VII of England, was a maternal descendant of the kings of Gwynedd; Henry's marriage with Elizabeth of York thus signified the merging of the two royal houses (as well as the feuding houses of York and Lancaster).

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