- Alfonso V, King of Aragon, 1396-14581
- Alfonso V, King of Asturias and León, 994-1027 or 10281
- Alfonso VI, King of Castile and Leon, 1030-11091
- Alfonso VII, The Emperor, King of Castile, 1104-11571
- Alfonso VIII, King of Castile, 1155-12141
- Alfonso X, King of Castile and Leon, 1221-12844
- Alfīyah (Ibn Mālik, Muḥammad ibn ʻAbd Allāh)5
- Alliata family1
- Almanacs1
- Almucantar1
- Alvarez family1
- Amadori family1
- Amadori, Francesco1
- Amadori, Lorenzo1
- Ambassadors5
- Ambrogio, Leonardo d'1
- Amedei, Bartolomeo1
- Amelius, Martyr1
- America15
- Amicus, Martyr1