- Astronomy, Ancient1
- Astronomy, Arab1
- Astronomy, Medieval1
- Athīr al-Dīn al-Abharī, al-Mufaḍḍal ibn ʻUmar, -1265. Hidāyat al-ḥikmah1
- Atlases (Geographic)1
- Augustine, of Hippo, Saint, 354-4301
- Augustinians1
- Augustus, Emperor of Rome, 63 B.C.-14 A.D.1
- Autos-da-fé1
- Ballads1
- Battle Abbey1
- Battle of Agincourt (Agincourt, France : 1415)1
- Battle of Pharsalus (Farsala, Greece : 48 B.C.)1
- Belgium--Brabant1
- Belgium--Nivelles1
- Benedictine nuns1
- Benelux countries1
- Besalú family1
- Bible. Ecclesiastes1
- Bible. Epistles of Paul1