text: The  principal manuscripts are:
  * The Lucca MS, Lucca, Biblioteca Capitolare Feliniana, Codex 490, the oldest witness, c. 800.
  * The Sélestat MS, Sélestat, Bibliothèque Humaniste, MS 17. A very full yet old witness, early ninth century.
  * The Codex Matritensis (Madrid codex), Madrid, Biblioteca Nacional, MS A.16 (Was: MS A.19), c. 1130.
  * The Phillipps-Corning Manuscript, Corning Museum of Glass, MS 5, late twelfth century.
  These  are simply among the fullest witnesses - there are dozens more that preserve extracts.