Columbia subject headings:
Harvard subject headings:
Fernando I, King of Portugal, 1345-1383.
John I, King of Portugal, 1357-1433.
Lopes, Fernão, approximately 1380---Political science.
Monarchy.
Pedro I, King of Portugal, 1320-1367.
Power (Social sciences)
Princeton subject headings:
Fernando I, King of Portugal, 1345-1383.
John I, King of Portugal, 1357-1433.
Lopes, Fernão, approximately 1380---Political science.
Monarchy.
Pedro I, King of Portugal, 1320-1367.
Power (Social sciences)