- Albizzi, Costanza1
- Albums (Books)1
- Alchemy--Bibliography1
- Alcuin, 735-8041
- Alcuin, 735-804. Correspondence1
- Aldobrandini, Giovanni degli1
- Aleramo, Marquis of Monferrato, -9671
- Alessandri, Alessandro degli1
- Alessandri, Niccolò degli1
- Alessandro, Pietro di1
- Alexander Balas, King of Syria, -145 B.C.1
- Alexander, de Villa Dei. Doctrinale puerorum1
- Alfonso V, King of Aragon, 1396-14581
- Alliata family1
- Almanach perpetuum celestium motuum (Zacuto, Abraham ben Samuel)1
- Altoviti, Bartolomea1
- Alum tawed thongs (Bindings)1
- Amadori, Lorenzo1
- Ambrogio, Leonardo d'1
- Ambrose, Saint, Bishop of Milan, -3971