Columbia subject headings:
Germany--Foreign relations--Great Britain.
Germany--History--Hohenstaufen, 1138-1254.
Great Britain--Foreign relations--Germany.
Harvard subject headings:
Germany--Foreign relations--Great Britain.
Germany--History--Hohenstaufen, 1138-1254.
Great Britain--Foreign relations--Germany.
Princeton subject headings:
Great Britain--Foreign relations--Holy Roman Empire.
Guelf, House of--History.
Holy Roman Empire--Foreign relations--Great Britain.