Columbia subject headings:
Laity--Catholic Church.
Laity.
Peter Damian, Saint, 1007?-1072.
Harvard subject headings:
Laity--Catholic Church--History.
Laity.
Peter Damian, Saint, 1007?-1072.
Princeton subject headings:
Laity--Catholic Church.
Laity.
Peter Damian, Saint, 1007?-1072.