- 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
- Alfīyah (Ibn Mālik, Muḥammad ibn ʻAbd Allāh)1
- Almanacs1
- Amelius, Martyr1
- Amicus, Martyr1
- Ana, Queen, consort of Philip II, King of Spain, 1549-15801
- Andronicus II Palaeologus, Emperor of the East, 1260-13321
- Anecdotes1
- Anglo-Norman dialect1
- Anjou, François, duc d', 1554-15841
- Anthony, of Egypt, Saint, approximately 250-355 or 3561
- Anthropomorphic letters1
- Antidotes1
- Anwār al-tanzīl wa-asrār al-taʼwīl (Bayḍāwī, ʻAbd Allāh ibn ʻUmar)1
- Apollonius, of Tyana1
- Apostasy--Catholic Church1
- Arabian Peninsula1