- Anthony, of Egypt, Saint, approximately 250-355 or 3561
- Apocryphal books (Old Testament)1
- Apostasy--Catholic Church1
- Arabic language1
- Armenian language1
- Armenian language, Classical1
- Armorial bindings1
- Armorial stamps1
- Arthurian romances1
- Astrolabes1
- Astronomy, Greek1
- Augustine, of Hippo, Saint, 354-4301
- Ballads, Italian1
- Battle of Agincourt (Agincourt, France : 1415)1
- Belgium--Bruges1
- Bembo, Pietro, 1470-15471
- Benedictines1
- Benefices, Ecclesiastical1
- Bermúdez family1
- Besalú family1