Branwen, Daughter of Llyr 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 Llyr and Penarddun. She is married to the King of Ireland, but the marriage does not bring peace.
[Celtic] The Celtic goddess of love and beauty. Also of Manx and Wales. She is the sister of Bran the Blessed and Manannan mac Lir, daughter of Lir, and wife of the Irish king Matholwch. She is similar to the Greek goddess Aphrodite and the Roman goddess Venus. After the death of her brother Bran, due to a war caused by Matholwch, Branwen died of a broken heart.