- Alexander Balas, King of Syria, -145 B.C.1
- Alexander, the Great, 356 B.C.-323 B.C.1
- Algebra1
- Ambrosian chants1
- Ambrosian rite (Catholic Church)1
- Anselm, Saint, Archbishop of Canterbury, 1033-11091
- Antiphonaries1
- Antiphons (Music)1
- Apocryphal Gospels1
- Apocryphal books (New Testament)1
- Arithmetic1
- Assumption of the Blessed Virgin Mary1
- Astrolabes1
- Aubertus, de Galardone1
- Autographs1
- Bede, the Venerable, Saint, 673-7351
- Berengarius, Raimundus1
- Bible1
- Bible. Chronicles, 2nd1
- Bible. Daniel1