Former Owner
- Boies Penrose II1
- Bone, Michael1
- Bonvesino, Marco1
- Bridget Hunt1
- Bridgewater Library1
- Bristol Baptist College1
- Burg Kreuzenstein1
- Burndy Library1
- Camillo Riccio1
- Carleton Rubira Richmond1
- Carlo Archinto, 2nd Marquess of Parona, 3rd Count of Trainate1
- Catherine Conduitt1
- Cecil Deedes1
- Charles Augustus Stoddard1
- Charles Burr1
- Charles F. Gunther1
- Charles Golding1
- Charles Seymour, 6th Duke of Somerset1
- Charles Stephen Ascherson1
- Collegium Germanicum et Hungaricum1