- Bourbon, Jacques de, 1370-14381
- Buffoni, Baldello1
- Bulls, Papal1
- Bēssariōn, Cardinal, 1403-14721
- Caesar, Julius1
- Canon law1
- Cappucci, Arrigo di1
- Carrillo family1
- Carrillo, Pedro, -approximately 1436--Family1
- Cartularies1
- Categoriae (Aristotle)1
- Cathedral bindings1
- Catholic Church. Archdiocese of Siena (Italy)1
- Cathédrale de Chartres1
- Ceccoli, Baldo1
- Ceccoli, Bartolo1
- Certano, Daina di1
- Chained bindings1
- Charles V, Holy Roman Emperor, 1500-15581
- Charles VI, King of France, 1368-14221