Author
- Andreas de Escobar1
- Andrew Welch1
- Andrés Bernáldez1
- Angelo Gambiglioni1
- Angelus Callimachus de Monteviridi1
- Aniruddha1
- Anne Baker Lewis1
- Anton Francesco Doni1
- Antonia Tanini Pulci1
- Antonino Castaldo1
- Antonius Ferro1
- Antonius of Vercelli1
- Arles1
- Armenian Catholic Church1
- Arnulf of Bohéries1
- Arnulf of Orléans1
- Asher ben Jehiel1
- Athanasius of Alexandria1
- Augustinians1
- Augustinus de Leonissa1