- Alba, Fernando Alvarez de Toledo, duque de, 1507-15821
- Alfonso I King of Asturias, 693-7561
- Alfonso III, King of Asturias and Leon, approximately 848-approximately 9101
- 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
- Algeria--Hippo (Extinct city)1
- Allegories1
- Alphabets1
- Alvarez family1
- Ana, Queen, consort of Philip II, King of Spain, 1549-15801
- Anaya, Diego de1
- Anaya, Pedro1
- Angulo family1
- Angulo, Alonso de1
- Annunciation to the Blessed Virgin Mary1
- Antiphonaries (Service books)1
- Apologetic writings1