Columbia subject headings:
Fernando I, King of Portugal, 1345-1383.
John I, King of Portugal, 1357-1433.
Pedro I, King of Portugal, 1320-1367.
Harvard subject headings:
Fernando I, King of Portugal, 1345-1383.
John I, King of Portugal, 1357-1433.
Pedro I, King of Portugal, 1320-1367.
Princeton subject headings:
Fernando I, King of Portugal, 1345-1383.
John I, King of Portugal, 1357-1433.
Pedro I, King of Portugal, 1320-1367.