MS 45 contains numerous documents relating to the Council of Constance (1414–1418). The council resolved a split in the Roman Catholic Church known as the Great Schism (1378–1417), during which time there were multiple rival popes. MS 45 was produced in England in the mid- to late-fifteenth century.
A full catalogue entry is available here.
MS 235 (medieval portions only)
MS 235 is a collection of binding fragments removed from College books. These fragments variously date to between the eleventh and the fifteenth centuries. The range of contents is diverse and includes liturgy, sermons, medicine, philosophy, theology, geometry, and law. Fragment 48 is shown here.
Catalogue entries for several fragments are available here.