- Astronomy, Ancient1
- Astronomy--Popular works1
- Attila, -4531
- Augsburg Confession1
- Aurispa, Giovanni, approximately 1376-14591
- Austria--Lambach (Upper Austria)1
- Autograph albums1
- Aveiro, Gabriel de Lencastre, Duque de, 1667-17451
- Baptism1
- Baptism of Jesus Christ1
- Barbara, Saint1
- Baroncelli, Francesco1
- Bartolo, of Sassoferrato, 1313-13571
- Basil, Saint, Bishop of Caesarea, approximately 329-3791
- Bateman family1
- Batignano, Carlo Gasparie di1
- Battle Abbey1
- Battle of Lepanto (Greece : 1571)1
- Beards1
- Bebel, Heinrich, 1472-15181