- Ashkenazi, Ẓevi Hirsch ben Jacob, -17181
- Ashkenazim1
- Astronomical instruments1
- Astronomy, Medieval1
- Athīr al-Dīn al-Abharī, al-Mufaḍḍal ibn ʻUmar, -1265. Hidāyat al-ḥikmah1
- Auctions1
- Augustinians1
- Aurispa, Giovanni, approximately 1376-14591
- Austria1
- Austria--Vienna1
- Aveiro, Gabriel de Lencastre, Duque de, 1667-17451
- Ayyubids1
- Babur, Emperor of Hindustan, 1483-15301
- Bartolomeo, da Petroio, 1488?-15541
- Basilica di S. Marco Evangelista al Campidoglio (Rome, Italy)1
- Bassini, Antonio1
- Battle of Agincourt (Agincourt, France : 1415)1
- Battle of Covadonga (Covadonga, Spain : 718)1
- Battle of Pharsalus (Farsala, Greece : 48 B.C.)1
- Bayezid II, Sultan of the Turks, 1447 or 1448-15121