Columbia subject headings:
Bishops--Germany--Temporal power--Congresses.
Bishops--Italy--Temporal power--Congresses.
Harvard subject headings:
Bishops--Germany--Temporal power--Congresses.
Bishops--Italy--Temporal power--Congresses.
Princeton subject headings:
Bishops--Germany--Temporal power--Congresses.
Bishops--Italy--Temporal power--Congresses.