Columbia subject headings:
Portugal--History--John VI, 1816-1826.
Harvard subject headings:
Brazil--Foreign relations--Portugal.
Brazil--History--1763-1822.
John VI, King of Portugal, 1767-1826
Monarchy--Portugal--History--19th century.
Portugal--Foreign relations--Brazil.
Portugal--History--John VI, 1816-1826.
Rio de Janeiro (Brazil)--History--19th century.
Princeton subject headings: