- Acciaiuoli, Roberto, 1467-15471
- Actions and defenses1
- Administration1
- Administration of estates1
- Agustín, Antonio, 1517-1586. Dialogos de medallas inscriciones y otras antiguedades1
- Alba, Fernando Alvarez de Toledo, duque de, 1507-15821
- Aleramo, Marquis of Monferrato, -9671
- Alfonso X, King of Castile and Leon, 1221-12841
- Aljamía1
- Anaya, Diego de1
- Annotations1
- Annunciation to the Blessed Virgin Mary1
- Apostasy--Catholic Church1
- Aragon (Spain). Cortes1
- Architecture1
- Architecture, Roman1
- Argonauts (Greek mythology)1
- Augustinians1
- Autos-da-fé1
- Bacán, Hernando de1