Author
- António das Chagas1
- Apostolic Camera1
- Archduke Ernest of Austria1
- Arjāsp Umīdī al-Ṭihrānī1
- Arles1
- Arnold Goerinus1
- Arnold-André Sittard1
- Arnulf of Bohéries1
- Arnulf of Lisieux1
- Arnulf of Orléans1
- Arrigucci family1
- Arşı Baba1
- Asad Allāh ibn ʻAbd al-Ghaffār Nādir Māzandarānī1
- Ascanio Sforza1
- Asiriddini Akhsikatī1
- Asmus Biersteden1
- Assembly of the French clergy1
- Ataullah Mehmet Efendi1
- Athanasius of Alexandria1
- Athīr al-Dīn al-Abharī1