- Arnaldus, de Villanova, -13111
- Arrigucci, Andrea1
- Arrigucci, Donato1
- Asceticism1
- Assassination1
- Astrology, Hebrew1
- Astrology--Religious aspects1
- Astronomy, Greek1
- Athīr al-Dīn al-Abharī, al-Mufaḍḍal ibn ʻUmar, -1265. Hidāyat al-ḥikmah1
- Auctions1
- Audiore, Antonio1
- Augsburg Confession1
- Austria--Lambach (Upper Austria)1
- Austria--Vienna1
- Autos-da-fé1
- Badʼ al-amālī (Ūshī, ʻAlī ibn ʻUthmān)1
- Bahjah al-Wardīyah (Ibn al-Wardī, Zayn al-Dīn ʻUmar ibn al-Muẓaffar)1
- Bahjah al-marḍīyah (Suyūṭī)1
- Bahrām V, King of Iran, -4381
- Balaibalan1