Columbia subject headings:
Leonardo, da Vinci, 1452-1519.
Ludovico Sforza, Duke of Milan, 1452-1508--Art patronage.
Milan (Italy)--Civilization.
Harvard subject headings:
Leonardo, da Vinci, 1452-1519
Ludovico Sforza, Duke of Milan, 1452-1508--Art patronage.
Milan (Italy)--Civilization.
Princeton subject headings:
Leonardo, da Vinci, 1452-1519.