Columbia subject headings:
Harvard subject headings:
Constitutional history--Holy Roman Empire
Land tenure--Germany--History--14th century.
Landfriede.
North Rhine-Westphalia (Germany)--History.
Princeton subject headings:
Landfriede.
Meuse River Valley--Politics and government.
Monarchy--Meuse River Valley--History.
Monarchy--Rhine River Valley--History.
Rhine River Valley--Politics and government.