Author
- Al-Khazini1
- Al-Mawardi1
- Al-Mubashshir ibn Fātik1
- Al-Qastallani1
- Albrecht von Eyb1
- Alcuin1
- Aldobrandino da Siena1
- Alessandro Farnese1
- Alessandro Piccolomini1
- Alfonso Spezzani1
- Ali Qushji1
- Ali ibn Mohammed al-Jurjani1
- Ambrose1
- Anantabhaṭṭa1
- Anantadeva1
- Andrea Amadio1
- Andreas Vesalius1
- Andreas de Escobar1
- Antonius de Vecelli1
- António Nunes Ribeiro Sanches1