- 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
- Aljamía1
- Allegories1
- Alphabets1
- Angulo family1
- Angulo, Alonso de1
- Annals and chronicles1
- Annunciation to the Blessed Virgin Mary1
- Antiphonaries1
- Antiquities1
- Aragon (Spain). Cortes1
- Architecture1
- Architecture, Roman1
- Argonauts (Greek mythology)1
- Astrology1
- Atlases (Geographic)1
- Augustine, of Hippo, Saint, 354-4301