1. Harley MS 531, ff 133r-134r Reference (shelfmark): Harley MS 531, ff 133r-134r Title: 'Tractatus de naturiis planetarum' Scope & Content: Astronomical text listed in the table of contents as 'Tractatus de naturiis planetarum', incipit: 'Saturnus est primus que scripsimus...' Decoration: Initials in red. Includes two tables (ff. 133v, 133r). Collection Area: Western Manuscripts Languages: Latin Date Range: Mid 15th century Extent: 2 folios.