- Alfonso I King of Asturias, 693-7561
- Alfonso III, King of Asturias and Leon, approximately 848-approximately 9101
- 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
- Allegories1
- Ana, Queen, consort of Philip II, King of Spain, 1549-15801
- Anaya, Pedro1
- Antiphonaries (Service books)1
- Apostasy--Catholic Church1
- Aragon (Spain). Cortes1
- Architecture1
- Architecture, Roman1
- Argonauts (Greek mythology)1
- Atlases (Geographic)1
- Bacán, Hernando de1
- Battle of Covadonga (Covadonga, Spain : 718)1
- Bello family1
- Benefices, Ecclesiastical1