Branwen

Branwen, Daughter of Llŷr is a major character in the Second Branch of the ''Mabinogi'', which is sometimes called the "Mabinogi of Branwen" after her.

Branwen is a daughter of Llŷr and Penarddun. She is married to Matholwch, King of Ireland, but the marriage does not bring peace. Provided by Wikipedia