- Affinity (Law)1
- Agnes, Saint, Martyr1
- Agriculture1
- Agriculture--Economic aspects1
- Albigenses1
- Alchemy--Bibliography1
- Alexander Balas, King of Syria, -145 B.C.1
- Alexander, de Villa Dei. Doctrinale puerorum1
- Alexius, Saint1
- Alfonso II, King of Naples, 1448-14951
- Alfonso X, King of Castile and Leon, 1221-12841
- Algeria--Hippo (Extinct city)1
- Allegories1
- Alphabets1
- Ambrose, Saint, Bishop of Milan, -3971
- Ambrosian rite (Catholic Church)1
- Amelius, Martyr1
- Amicus, Martyr1
- Animals1
- Anne (Mother of the Virgin Mary), Saint1