- Alexander, the Great, 356 B.C.-323 B.C.1
- 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
- Alfonso X, King of Castile and Leon, 1221-12842
- Aljamía1
- Allegories1
- Alonso de Bracamente1
- Amelius, Martyr1
- America3
- Amicus, Martyr1
- Ana, Queen, consort of Philip II, King of Spain, 1549-15802
- Anaya, Pedro1
- Annals and chronicles2
- Annotations8
- Anthologies1
- Anthony, of Padua, Saint, 1195-12311