- Accursius, glossator, approximately 1182-approximately 12601
- Actions and defenses1
- Administration1
- Aeneas (Legendary character)1
- Agriculture--Economic aspects1
- Albertus de Fontanella1
- Albizzi, Costanza1
- Aldobrandini, Giovanni degli1
- Aleramo, Marquis of Monferrato, -9671
- Alessandri, Bartolomeo degli1
- Alessandri, Piero degli1
- Allegory1
- Alliata family1
- Altoviti, Bartolomea1
- Amadori, Bartolomeo1
- Amadori, Niccolo1
- Ambassadors1
- Ambrosian rite (Catholic Church)1
- Amedei, Bartolomeo1
- Amulets1