- Arrighi family1
- Arrigucci, Andrea1
- Arrigucci, Donato1
- Ashkenazim1
- Assassination1
- Astronomy, Greek1
- Attila, -4531
- Augustus, Emperor of Rome, 63 B.C.-14 A.D.1
- Aurispa, Giovanni, approximately 1376-14591
- Avodah (Yom Kippur liturgy)1
- Azar, Menaḥem ben Natan1
- Bankers1
- Baptism--Catholic Church1
- Bar mitzvah1
- Bar mitzvah sermons1
- Bardi, Giovanni de', conte di Vernio, 1534-16121
- Bartolomeo, da Petroio, 1488?-15541
- Basil, Saint, Bishop of Caesarea, approximately 329-3791
- Basilica di S. Marco Evangelista al Campidoglio (Rome, Italy)1
- Battle of Pharsalus (Farsala, Greece : 48 B.C.)1