- Albigenses1
- Albums1
- Albums (Books)1
- Alchemy--Bibliography1
- Alcuin, 735-8041
- Alexander Balas, King of Syria, -145 B.C.1
- Alexander, de Villa Dei. Doctrinale puerorum1
- Ambrose, Saint, Bishop of Milan, -3971
- Ambrosian rite (Catholic Church)1
- Amelius, Martyr1
- Amicus, Martyr1
- Anecdotes1
- Animals1
- Annals and chronicles1
- Anne (Mother of the Virgin Mary), Saint1
- Annunciation to the Blessed Virgin Mary1
- Anselm, Saint, Archbishop of Canterbury, 1033-11091
- Anticlaudianus (Alanus, de Insulis)1
- Antiphonaries--Manuscripts1
- Antiquities1