Author
- Alfonso Spezzani1
- Alfonso X of Castile and Leon1
- Ali ibn Mohammed al-Jurjani1
- Alonso Carrillo y Laso1
- Alonzo de Santa Cruz1
- Ambrose1
- Amir Khosrow1
- Anantabhaṭṭa1
- Anantadeva1
- Andrea Amadio1
- Andreas de Escobar1
- Andrés Bernáldez1
- Antonio de Villegas1
- Antonio de la Torre1
- Antonius de Vecelli1
- António Vieira1
- Apostolic Camera1
- Arles1
- Arnulf of Bohéries1
- Arrigucci family1