- Alexander III, Pope, -11811
- Alexander, de Villa Dei. Doctrinale puerorum1
- Alfonso X, King of Castile and Leon, 1221-12841
- Allegories1
- Alleluias (Chants)1
- Almanacs, German1
- Alonso de Bracamente1
- Alphabets1
- Alum tawed bindings1
- Alum tawed thongs (Bindings)1
- Alvarez family1
- Amadori, Lorenzo1
- Ambrogio, Leonardo d'1
- Ambrose, Saint, Bishop of Milan, -3971
- Ambrosian rite (Catholic Church)1
- Amedei, Bartolomeo1
- Amidah (Jewish prayer)1
- Amideo, Chele d'1
- An authorization to perform a ritual slaughter according to the Jewish law by Avraham Mosheh Leʼon of Carpentras to his son Daniʼel, written on 25 of Tamuz 17641
- Anaphora1