- Arrighi family1
- Art1
- Asceticism1
- Assassination1
- Assumption of the Blessed Virgin Mary1
- Astronomy, Arab1
- Astronomy, Medieval1
- Augustine, of Hippo, Saint, 354-4301
- Aurispa, Giovanni, approximately 1376-14591
- Bankers1
- Bardi, Giovanni de', conte di Vernio, 1534-16121
- Bartholomeo, de Soncino1
- Bartoli, Dianora1
- Bartoli, Giannozzo1
- Basil, Saint, Bishop of Caesarea, approximately 329-3791
- Basilica di San Marco (Venice, Italy)1
- Battle of Lepanto (Greece : 1571)1
- Battle of Pharsalus (Farsala, Greece : 48 B.C.)1
- Bedtime prayers1
- Benedict, Saint, Abbot of Monte Cassino1