AHC: Medieval Gaelic Empire

You challenge is to create a Gaelic empire after the year 800. The empire must include Ireland, Scotland, Wales and Brittany. The empire must be ruled from one of those aforementioned regions. That one bit of Hispania with Gaelic’s is worth bonus points if you can get it.
 
Something something Brian Boru and his children survive the Battle of Clontarf. That's the more-or-less default PoD for uniting medieval Ireland.
From there on in, have the Irish kings build up marriage alliances with Scotland, Wales, and Brittany. One problem, however, would be dislodging Brittany from the French crown.
 
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Henry II's plans to restore an Irish Crown go through and John later holds both England and Ireland in union. His second son Richard goes on to obtain Ireland founding a strong line of kings who eventually gain overlordship of Wales and union with Scotland. A younger son becomes the compromise candidate in a Breton Succession War then succeeds to crown after a series of mishaps.

I should also point out that neither Wales nor Brittany are Gaelic and that the Scottish Lowlands aren't either.
 
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