- Aleramo, Marquis of Monferrato, -9671
- 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
- Aljamía1
- Annals and chronicles1
- Anthologies1
- Anthony, of Padua, Saint, 1195-12311
- Antiquities1
- Apostasy--Catholic Church1
- Aragon (Spain). Cortes1
- Architecture1
- Architecture, Roman1
- Archival materials1
- Art1
- Astrology1
- Astronomy1