- Alessandri, Piero degli9
- Alessandri, Pietro degli2
- Alessandro, Pietro di1
- Alexander Balas, King of Syria, -145 B.C.1
- Alexander III, Pope, -11811
- Alexander, de Villa Dei. Doctrinale puerorum1
- Alexander, the Great, 356 B.C.-323 B.C.5
- Alexius, Saint1
- Alfonso V, King of Aragon, 1396-14581
- Alfonso X, King of Castile and Leon, 1221-12841
- Algebra2
- Allegories1
- Alliata family1
- Almagest (Ptolemy)1
- Almanacs2
- Alphabet--Religious aspects--Hinduism2
- Alphabets1
- Altars1
- Altoviti, Bartolomea1
- Amadori family13