In Giangaleazzo that passion for the colossal which was
common to most of the despots shows itself on the largest scale. He undertook,
at the cost of 300,000 golden florins, the construction of gigantic dikes, to
divert in case of need the Mincio from Mantua and the Brenta from Padua, and
thus to render these cities defenseless. It is not impossible, indeed, that he
thought of draining away the lagoons of Venice. He founded that most wonderful
of all convents, the Certosa of Pavia and the cathedral of Milan, 'which
exceeds in size and splendor all the churches of Christendom.' The palace in
Pavia, which his father Galeazzo began and which he himself finished, was
probably by far the most magnificent of the princely dwellings of Europe. There
he transferred his famous library, and the great collection of relics of the
saints, in which he placed a peculiar faith. It would have been strange indeed
if a prince of this character had not also cherished the highest ambitions in
political matters. King Wenceslaus made him Duke (1395); he was hoping for
nothing less than the Kingdom of Italy or the Imperial crown, when (1402) he
fell ill and died. His whole territories are said to have paid him in a single
year, besides the regular contribution of 1,200,000 gold florins, no less than
800,000 more in extraordinary subsidies. After his death the dominions which he
had brought together by every sort of violence fell to pieces: and for a time
even the original nucleus could with difficulty be maintained by his
successors. What might have become of his sons Giovanni Maria (died 1412) and
Filippo Maria (died 1447), had they lived in a different country and under
other traditions, cannot be said. But, as heirs of their house, they inherited
that monstrous capital of cruelty and cowardice which had been accumulated from
generation to generation.