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.

Brân the Blessed is a giant and king of Britain in Welsh mythology. He appears in several of the Welsh Triads, but his most significant role is in the Second Branch of the Mabinogi, Branwen ferch Llŷr. He is a son of Llŷr and Penarddun, and the brother of Brânwen, Manawydan, Nisien and Efnysien. The name "Brân" in Welsh is usually translated as crow or raven.