It originated in the San Salvador de Tábara Monastery and is now held in Spain's National Historical Archive in Madrid under the catalogue number L.1097B.
A colophon on folio 167 of the manuscript states it was completed by a scribe called Emeterius on 29 July 970 in the scriptorium of the San Salvador Monastery in Tábara.
This hypothesis is not universally accepted and John Williams argues that all the work's folios belong to the same manuscript.
[2] One of the manuscript's later owners was Ramón Alvarez de la Braña, a librarian in Leon, from which it entered the collection of the School of Diplomacy in Madrid and then its present home.
Glosses in Arabic are noted in the margins, showing that the monastery which produced and used it contained Mozarabic monks.