- Bulqīnī, ʻUmar ibn Raslān, 1324-14031
- Burial laws (Jewish law)1
- Burlaeus, Gualterus, 1275-1345?1
- Business records1
- Byzantine chants1
- Caesar, Julius1
- Calendar1
- Canon law--Commentaries1
- Canon law--Interpretation and construction1
- Canticles1
- Capponi family1
- Capponi, Bernardo1
- Capponi, Cappone1
- Cappucci, Arrigo di1
- Carthusians1
- Categoriae (Aristotle)1
- Categories (Philosophy)1
- Catherine, of Alexandria, Saint1
- Catholic Church. Archdiocese of Reims (France)1
- Catholic Church. Diocese of Salisbury (England)1