Columbia subject headings:
Councils and synods, Ecumenical.
Theology, Doctrinal--History--Early church, ca. 30-600.
Theology, Doctrinal--History--Middle Ages, 600-1500.
Harvard subject headings:
Councils and synods, Ecumenical.
Theology, Doctrinal--History--Early church, ca. 30-600.
Theology, Doctrinal--History--Middle Ages, 600-1500.
Princeton subject headings:
Councils and synods, Ecumenical.
Theology, Doctrinal--History--Early church, ca. 30-600.
Theology, Doctrinall--History--Middle Ages, 600-1500.