Author
- Albertus Magnus1
- Albrecht von Eyb1
- Alessandro Piccolomini1
- Ali Qushji1
- Andreas Vesalius1
- Andreas de Escobar1
- Anne Baker Lewis1
- Antonino Castaldo1
- Antonius Ferro1
- Arles1
- Armenian Catholic Church1
- Arnaldus de Villa Nova1
- Arnulf of Bohéries1
- Augustine of Hippo1
- Augustinians1
- Augustinus de Leonissa1
- Azar Bigdeli1
- Aḥmad ibn Qāsim Ghazzī1
- Aḥmad ibn Ḥusayn Ibn al Qunfudh1
- Baháʼu'lláh1