Oxford owners
The single plate is for the latitude of Oxford and the astrolabe belongs to Oriel College. It may be associated with the group of mathematicians in 14th-century Oxford known as the 'Merton School', perhaps coming to the College among the astronomical instruments bequeathed by the astronomer Simon Bredon, who had been a Fellow of Merton in about 1330.
Astrolabe, Oxford?, c.1350 (Inv. 47901)