Author
- Albrecht von Eyb1
- Alcuin1
- Alexander V1
- Alexander VI1
- Alfnāry1
- Alfonso de Cartagena1
- Alfonso de Palencia1
- Ali al-Bistami1
- Alisa of Bastogne, active 15th century1
- Alʼmywṭy1
- Alṭaaāʼī1
- Andrea Amadio1
- Andreas de Escobar1
- Angelus Callimachus de Monteviridi1
- Anselm of Canterbury1
- Antonius Ferro1
- Antonius of Vercelli1
- Arles1
- Armenian Catholic Church1
- Athanasius of Alexandria1