Columbia subject headings:
Cardinals--Italy--Biography.
Petrus Capuanus, Cardinal, -1214.
Harvard subject headings:
Cardinals--Biography
Crusades--Fourth, 1202-1204
Petrus Capuanus, Cardinal, -1214.
Petrus, Capuanus, -1214.
Princeton subject headings:
Cardinals--Italy--Biography.
Petrus Capuanus, Cardinal, -1214.