It was owned by John Dee (1527-1608/9), the astronomer, astrologer, mathematician, alchemist, book-collector, advisor to Elizabeth I, and general polymath; on fols.1r and 2r it has two markings typical of books he owned: the repeated Jupiter symbol (♃) and the ladder-like symbol:
Dee also writes his name and the date, as well as the ladder symbol, above the start of a prefatory text (fol.4r):
|Ladder symbol and "Joannes Dee 1557 Londini | mense martio"|
In his catalogue of the Corpus medieval Latin and vernacular manuscripts, Rod Thomson simply states "Owned and partly written by an unidentified Lewys":
I recognised the name and the handwriting; they occur in a huge and wonderful astronomical volume from the Macclesfield Library (but not in the Sotheby's Macclesfield sales), that I had catalogued for Sam Fogg in 2009, which has an unbroken provenance of thirteen owners from Sir Henry Spelman (d.1641) to the present day. Many of the astronomical tables in the volume are attributed to the Welsh physician and astronomer Lewis Caerleon:
|"Explicit opus Lodowyci Caerlyon in medicis doctoris c(ir)ca tabulas umbrar(um)|
Anno incarna(tion)is i(m)p(er)f(e)c(t)o 1482 .30. die mensis April apud London."
|"Hic incipit op(us) Eclipsiu(m) p(er) me Lodowycu(m) ..."|
|"Ego existens i(n)carc(er)at(us) i(n) turre Londoniar(um) (com)posui alias ta(bu)las ..."|
A considerable number of manuscripts by Lewis, or with his annotations, are known, and I was pleased to think that I had found a new one. But when I went to check the standard article about his manuscripts by Pearl Kibre ("Lewis of Caerleon, Doctor of Medicine, Astronomer, and Mathematician (d. 1494?)", Isis, 43 no.2 (1952), pp.100-08), I found that she had got there more than 60 years before me:
So the attribution to Lewis is correct, but not new.
The first eight images in this post show Oxford, Corpus Christi College, MS 234, and are reproduced by permission of the President and Fellows of Corpus Christi College, Oxford.