Columbia subject headings:
Harvard subject headings:
Benedict XVI, Pope, 1927-
Benedict XVI, Pope, 1927---Abdication, 2013.
Catholic Church--History--21st century.
Francis, Pope, 1936-
Popes--Abdication
Princeton subject headings:
Benedict XVI, Pope, 1927-2022--Abdication, 2013.
Benedict XVI, Pope, 1927-2022.
Catholic Church--History--21st century.
Francis, Pope, 1936-
Popes--Abdication.