- Alfonso V, King of Aragon, 1396-14581
- 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, 1221-12843
- Alfīyah (Ibn Mālik, Muḥammad ibn ʻAbd Allāh)12
- Algebra6
- Allegories1
- Almagest (Ptolemy)1
- Amadori family2
- Ambrose, Saint, Bishop of Milan, -3971
- America2
- Ana, Queen, consort of Philip II, King of Spain, 1549-15802
- Ancestor worship--Hinduism1
- Andria (Terence)1
- Anecdotes2
- Angels1
- Animal culture1
- Animal sacrifice1