- Aggada1
- Agustín, Antonio, 1517-1586. Dialogos de medallas inscriciones y otras antiguedades1
- Alba, Fernando Alvarez de Toledo, duque de, 1507-15821
- Albigenses1
- Alchemy1
- Alchemy--Manuscripts1
- 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
- Aljamía1
- Allegories1
- Alonso de Bracamente1
- Amelius, Martyr1
- Amicus, Martyr1
- Anaya, Pedro1
- Anthologies1