It was stated by Geoffrey of Monmouth in his pseudo historical Historia Regnum Britannia that Cadwallon ap Cadfan married a half sister of Penda of Mercia.

Did he get that from other sources? Is it true. If so it affects if the monarchs of Mercia have known descendants.

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    Fourth downvote tonight; you haven't read the wikpedia article on the former. – John Dee Sep 4 '18 at 4:56
  • Not sure your point about descendants. There will be many people today who descend from Mercian royalty. – Daniel Sep 6 '18 at 0:56

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