- Augustinians1
- Aurispa, Giovanni, approximately 1376-14591
- Austria1
- Austria--Vienna1
- Autographs11
- Autographs (Provenance)2
- Aveiro, Gabriel de Lencastre, Duque de, 1667-17451
- Banks and banking3
- Basilica di S. Marco Evangelista al Campidoglio (Rome, Italy)1
- Bassini, Antonio1
- Battle of Covadonga (Covadonga, Spain : 718)1
- Battle of Karbalāʼ (Karbalāʼ, Iraq : 680)1
- Bayezid II, Sultan of the Turks, 1447 or 1448-15121
- Belgium1
- Belvis family1
- Benavides family1
- Benefices, Ecclesiastical1
- Bettini, Giovanbattista1
- Bettini, Luigi1
- Beverages1