- Alfonso VIII, King of Castile, 1155-12141
- Alliata family1
- Alvarez family1
- Ana, Queen, consort of Philip II, King of Spain, 1549-15801
- Anaya, Diego de1
- Anaya, Pedro1
- Annals and chronicles1
- Annotations1
- Annunciation to the Blessed Virgin Mary1
- Apologetic writings1
- Apostasy--Catholic Church1
- Aragon (Spain). Cortes1
- Argonauts (Greek mythology)1
- Augustinians1
- Bacán, Hernando de1
- Bargas family1
- Battle of Covadonga (Covadonga, Spain : 718)1
- Bello family1
- Belvis family1
- Benavides family1