The Exeter Book, also known as the Codex Exoniensis or Exeter Cathedral Library MS 3501, is a large codex of Old English poetry, believed to have been produced in the late tenth century AD. It is one of the four major manuscripts of Old English poetry, along with the Vercelli Book in Vercelli, Italy, the Nowell Codex in the British Library, and the Junius manuscript in the Bodleian Library in Oxford. Wikipedia