Boethius, De musica, f.43v, (211 x 144 mm), 12th century -This is a manuscript about the theory of music. It was copied probably in England at Christ Church, Canterbury, in the second quarter of the twelfth century. Its main focus is the mathematical basis of music - Alexander Turnbull Library, MSR-05., via Flickr.
Illuminated Manuscript Map of Cairo, from Book on Navigation. Originally composed in 932 AH / 1525 CE and dedicated to Sultan Süleyman I ("The Magnificent"), this great work by Piri Reis (d. 962 AH / 1555 CE) on navigation was later revised and expanded. The present manuscript, made mostly in the late 11th AH / 17th CE cent.
Illuminated Manuscript Map of the Bay of Salonica (Selānīk,Thessalonici) and the western coastline, from Book on Navigation, Walters Art Museum Ms. W.658, fol.52b by Walters Art Museum Illuminated Manuscripts