In reply to Iain Thow:
Interesting that you have this Elidyr as being from Lancashire. I’m interested in this one as someone with a keen interest in post Roman history, especially where it relates to Cumbria, and Lancashire would have been part of Rheged then which was the post Roman kingdom centred on Carlisle. I didn’t know Elidyr was meant to be buried up there.
I’ve heard of him as Elidyr of Strathclyde who was married to the daughter of King Maelgwyn of Gwynedd and launched a naval invasion against her brother, Rhun of Gwynedd, in the 550’s after Maelgwyn had died., Rhun seems to have been a pretty powerful king with strong support so I was surprised to see the name of his enemy celebrated so prominently in his heartland.
Neither Lancashire or Strathclyde would have had a lot to worry about from the Saxons until after 600AD. If he was exiled it would have been because of infighting between fellow Britons.