- Alexander III, Pope, -11811
- Alfonso X, King of Castile and Leon, 1221-12841
- Amadori family1
- Amadori, Francesco1
- Anaya, Diego de1
- Andrea, Michele di1
- Andreucci, Bartolomeo1
- Andronicus II Palaeologus, Emperor of the East, 1260-13321
- Anjou, François, duc d', 1554-15841
- Annunciation to the Blessed Virgin Mary1
- Anwār al-tanzīl wa-asrār al-taʼwīl (Bayḍāwī, ʻAbd Allāh ibn ʻUmar)1
- Apollonius, of Tyana1
- Apostasy--Catholic Church1
- Arab countries1
- Arabic language--Inflection1
- Arabic language--Morphology1
- Arabic language--Rhetoric1
- Arabic poetry1
- Aragon (Spain). Cortes1
- Argonauts (Greek mythology)1