The Mabinogi by Matthew Francis

This book has long been on my to-read list. Here's Faber's blurb:

"The Mabinogi is the Welsh national epic, a collection of prose tales of war and enchantment, adventure and romance, which have long fascinated readers all over the world. Matthew Francis’s retelling of the first four stories (the Four Branches of the Mabinogi) is the first to situate it in poetry, and captures the magic and strangeness of this medieval Celtic world: a baby is kidnapped by a monstrous claw, a giant wades across the Irish Sea to do battle, a wizard makes a woman out of flowers, only to find she is less biddable than he expected."