Columbia subject headings:
Chair of Saint Peter.
Papacy--History.
Peter, the Apostle, Saint--Cult.
Rome (Italy)--Church history.
Harvard subject headings:
Chair of Saint Peter.
Papacy--History
Peter, the Apostle, Saint--Cult.
Rome (Italy)--Church history.
Princeton subject headings:
Chair of Saint Peter.
Church history--Middle Ages, 600-1500.
Church history--Primitive and early church, ca. 30-600.
Papacy--History--To 1309.
Peter, the Apostle, Saint
Popes--Primacy--History.