- Actions and defenses1
- Administration1
- Adventure stories, Spanish1
- Aeneis (Virgil)1
- Agustín, Antonio, 1517-1586. Dialogos de medallas inscriciones y otras antiguedades1
- 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 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
- America1
- Annals and chronicles1
- Anthologies1
- Anthony, of Padua, Saint, 1195-12311
- Aragon (Spain). Cortes1
- Architecture1
- Architecture, Roman1