- 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
- Allegories1
- Alonso de Bracamente1
- Amelius, Martyr1
- Amicus, Martyr1
- Anaya, Pedro1
- Anthologies1
- Anthony, of Padua, Saint, 1195-12311
- Antiphons (Music)1
- Apostasy--Catholic Church1
- Aragon (Spain). Cortes1
- Architecture1
- Architecture, Roman1
- Argonauts (Greek mythology)1
- Arithmetic1