Columbia subject headings:
Harvard subject headings:
Alexander VI, Pope, 1431-1503--Correspondence.
Borgia family--Correspondence.
Italy--History--15th century--Sources.
Nobility--Italy--Correspondence.
Nobility--Spain--Correspondence.
Papacy--History--1447-1565--Sources.
Spain--History--Ferdinand and Isabella, 1479-1516--Sources.
Princeton subject headings:
Alexander VI, Pope, 1431-1503--Correspondence.
Borgia family--Correspondence.
Italy--History--1492-1559--Sources.
Nobility--Papal States--Correspondence.
Papacy--History--1447-1565--Sources.
Popes--Correspondence.