Columbia subject headings:
Cities and towns, Medieval--Europe--History.
Cities and towns--Holy Roman Empire--History.
Holy Roman Empire--History--Hohenstaufen, 1138-1254.
Holy Roman Empire--History--Lothair II, 1125-1137.
Harvard subject headings:
Cities and towns, Medieval--History.
Holy Roman Empire--History--843-1273.
Imperial cities (Holy Roman Empire)
Princeton subject headings:
Cities and towns, Medieval--Europe--History.
Cities and towns--Holy Roman Empire--History.
Holy Roman Empire--History--Hohenstaufen, 1138-1254.
Holy Roman Empire--History--Lothair II, 1125-1137.