Former Owner
- Boies Penrose II1
- Bridget Hunt1
- Budapest University of Jewish Studies1
- Burg Kreuzenstein1
- Burndy Library1
- Camillo Riccio1
- Carleton Rubira Richmond1
- Carlo Archinto, 2nd Marquess of Parona, 3rd Count of Trainate1
- Carlo Morbio1
- Cecil Deedes1
- Charles Augustus Stoddard1
- Charles Edwin Puckett1
- Charles F. Gunther1
- Charles Fairfax Murray1
- Charles Stephen Ascherson1
- Charles Stuart, 1st Baron Stuart de Rothesay1
- Collegium Germanicum et Hungaricum1
- Count Johann Nepomuk Wilczek1
- Cox Macro1
- D. Andreas Parisino1