- Blood--Circulation1
- Bona, Queen, consort of Sigismund I, King of Poland, 1494-15571
- Booksellers' labels1
- Breviary (Catholic Church)1
- Brulefer, Etienne, -approximately 14991
- Buonaccorsi family1
- Buonaccorsi, Constanza1
- Buonaccorsi, Niccolò di Piero1
- Buonaccorsi, Piero1
- Buondelmonte, Piero1
- Busdraghi, Matteo, 14th century1
- Busdraghi, Nicola, 14th century1
- Busdraghi, Piero, 14th century1
- Byzantine literature1
- Calendar1
- Calendar reform1
- Calendar, Gregorian1
- Calligraphy, Persian1
- Cancon (France)1
- Canonists1