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.