- Arnaldus, de Villanova, -13111
- Arrighi family1
- Astronomy, Ancient1
- Astronomy, Greek1
- Astronomy, Medieval1
- Attila, -4531
- Augustus, Emperor of Rome, 63 B.C.-14 A.D.1
- Aurispa, Giovanni, approximately 1376-14591
- Azar, Menaḥem ben Natan1
- Baptism--Catholic Church1
- Bardi, Giovanni de', conte di Vernio, 1534-16121
- 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
- Benefices, Ecclesiastical1
- Bernardino, da Siena, Saint, 1380-14441
- Bible and law1
- Bible. Acts1
- Bible. Corinthians1
- Bible. Deuteronomy1