 The prose stories from the White and Red Books are known as the "Mabinogion", a title given to them by their first translator, Lady Charlotte Guest, and also used by subsequent translators.Poems such as "Cad Goddeu" (The Battle of the Trees) and mnemonic list-texts like the "Welsh Triads" and the "Thirteen Treasures of the Island of Britain", also contain mythological material.These texts also include the earliest forms of the Arthurian legend and the traditional history of post-Roman Britain.