Columbia subject headings:
Councils and synods (Canon law)
Councils and synods, Ecumenical--History.
Councils and synods, Plenary (Canon law)
Harvard subject headings:
Appellate procedure (Canon law)--History.
Church history--Middle Ages, 600-1500
Councils and synods, Plenary (Canon law)--History.
Councils and synods.
Law, Medieval.
Princeton subject headings: