The Mabinogion is a collection of prose stories from medieval Welsh manuscripts. They are partly based on early medieval historical events, but almost certainly hark back to older Iron Age traditions. The stories of The Mabinogion appear in either or both of two Medieval Welsh manuscripts, the White Book of Rhydderch (Llyfr Gwyn Rhydderch) written ca. 1350, and the Red Book of Hergest (Llyfr Coch Hergest) written about 1382-1410, although texts or fragments of some of the tales have been preserved in earlier 13th century and later manuscripts. Scholars agree that the tales are older than the existing manuscripts, but disagree over just how much older.