Columbia subject headings:
Italy--History--15th century.
Milan (Italy)--Foreign relations.
Milan (Italy)--History--To 1535.
Harvard subject headings:
Diplomacy--History
Italy--History--15th century.
Milan (Italy)--Foreign relations.
Milan (Italy)--Politics and government.
Sforza family.
Princeton subject headings:
Italy--History--15th century.
Milan (Italy)--Foreign relations.
Milan (Italy)--Politics and government.