Author
- Alexander IV1
- Alexander V1
- Alfonso Spezzani1
- Alfonso de Cartagena1
- Alfred John Dunkin1
- Alfred of Sareshel1
- Alonzo de Santa Cruz1
- Alphonsus Pantius1
- Alulphe of Tournai1
- Ambrosiaster1
- Andrea Amadio1
- Andrea Piccolomini Todeschini1
- Andreas Raumburger1
- Andrew Norton of Bristow1
- Andrew Welch1
- Angelo Carletti di Chivasso1
- Angelo Gambiglioni1
- Angelus Callimachus de Monteviridi1
- Anquetil Raolée1
- Anselm of Laon1