Manuscript on vellum, Latin, approximately 1270; red and black. The Canones of Arzachel are preceded by a 2 leaf summary (folio 7-8) which internal evidence assigns to approximately 1407 or 8. See folio 112 for evidence. Binder's title on case: Toledo astronomical tables.
Gherardo, da Cremona, 1113 or 1114-1187; Arzachel, active 1080; William, of Marseilles, active 1231
University of Minnesota Libraries, James Ford Bell Library.