Branwen was given in marriage to Matholwch, King of Ireland, to seal peace between the islands, and she bore him a son, Gwern, who was made king of Ireland only to be murdered by Efnysien, igniting the war that destroyed both nations.
Brân the Blessed waged war on Matholwch, King of Ireland, after learning that Matholwch had degraded Branwen from queen to kitchen slave. Brân waded across the Irish Sea with his warband, and the ensuing battle destroyed nearly all of both nations.
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