Columbia subject headings:
Emilia-Romagna (Italy)--History--16th century.
Leonardo, da Vinci, 1452-1519--Homes and haunts--Italy--Emilia-Romagna.
Leonardo, da Vinci, 1452-1519--Knowledge and learning.
Military art and science.
Harvard subject headings:
Borgia, Cesare, 1476?-1507
Emilia-Romagna (Italy)--History--16th century.
Leonardo, da Vinci, 1452-1519--Homes and haunts--Italy--Emilia-Romagna.
Leonardo, da Vinci, 1452-1519--Knowledge--Military art and science.
Princeton subject headings:
Emilia-Romagna (Italy)--History--16th century.
Leonardo, da Vinci, 1452-1519--Homes and haunts--Italy--Emilia-Romagna.
Leonardo, da Vinci, 1452-1519--Knowledge--Military art and science.