Author
- Antonius de Carlenis1
- Antonius de Vecelli1
- Antonius of Vercelli1
- António Vieira1
- Apostolic Camera1
- Archduke Ernest of Austria1
- Arnaldus, of Brussels1
- Arnaud, Claude, active 1660-1661.1
- Arnold Goerinus1
- Arnold-André Sittard1
- Arnulf of Bohéries1
- Arnulf of Lisieux1
- Arnulf of Orléans1
- Arrigucci family1
- Ascanio Sforza1
- Athanasius of Alexandria1
- Audax1
- Augustinians1
- Augustinus Triumphus1
- Augustinus de Leonissa1