The Mabinogion (compiled from 12th–13th century Welsh manuscripts, with oral roots centuries earlier) comprises 11 prose tales blending mythology, folklore, and romance. Attributed to no single author, these stories—such as the Four Branches of the Mabinogi—feature figures like Pryderi, Rhiannon, and Branwen, exploring themes of magic, otherworlds (Annwn), kingship, betrayal, and transformation within a distinctly British Celtic framework. Though part of the broader Celtic continuum (extending the Irish Táin already noted), its preservation in Welsh distinguishes it as a vital repository of insular Celtic myth. Its influence on Western consciousness includes its role in Romantic-era Celtic revival and its contribution to Arthurian extensions (e.g., the Grail quest’s Welsh precursors). Modern fantasy owes much to its archetypal enchantments and heroic quests, which resonated with European writers seeking pre-Roman mythic depth.