Columbia subject headings:
Catholic Church--Foreign relations--Great Britain.
Great Britain--Foreign relations--Catholic Church.
Great Britain--Foreign relations--Italy--Papal States.
Papal States--Foreign relations--Great Britain.
Harvard subject headings:
Catholic Church--Foreign relations--Great Britain.
Great Britain--Foreign relations--Catholic Church.
Great Britain--Foreign relations--Italy--Papal States.
Great Britain--Foreign relations--Papal States.
Papal States--Foreign relations--Great Britain.
Princeton subject headings:
Great Britain--Foreign relations--Papal States.
Papal States--Foreign relations--Great Britain.