- Alfonso X, King of Castile and Leon, 1221-12841
- Amboise, Catherine d', 1481?-15501
- Ambrose, Saint, Bishop of Milan, -3971
- Anastasius, Sinaita, Saint, active 640-7001
- Andrea da Pistoia1
- Andrews, William, approximately 1635-17131
- Antoninus, Saint, Archbishop of Florence, 1389-14591
- Anṭākī, Dāʾūd ibn ʻUmar, -15991
- Après de Mannevillette, Jean-Baptiste-Nicolas-Denis d', 1707-1780, cartographer1
- Arderne, John, active 1307-13701
- Aristotle, pseud1
- Arnaldus, de Villanova, -13111
- Artelouche de Alagona1
- Atkinson, Jane, 1775-1855, artist1
- Averroës, 1126-11981
- Bagellardo, Paolo, d. 1492?1
- Balzani, Guglielmo1
- Baptista, Mantuanus, 1447-1516, author1
- Bar Zoʻbí, Yoḥanān.1
- Bartolo, of Sassoferrato, 1313-13571
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