Columbia subject headings:
John I, King of Portugal, 1357-1433--Travel--Portugal.
Portugal--Kings and rulers--Biography.
Harvard subject headings:
John I, King of Portugal, 1357-1433--Journeys--Portugal.
John I, King of Portugal, 1357-1433.
Portugal--History, Military.
Portugal--History--John I, 1385-1433.
Portugal--Kings and rulers--Biography.
Princeton subject headings:
John I, King of Portugal, 1357-1433.
Portugal--History, Military.
Portugal--History--John I, 1385-1433.