Columbia subject headings:
Harvard subject headings:
Orthodox Eastern Church--Greece--Thessalonikē--History--Congresses.
Thessalonikē (Greece)--Church history--Congresses.
Princeton subject headings:
Church history--Primitive and early church, ca. 30-600.
Orthodox Eastern Church--Greece--Thessalonikē--History--Congresses.
Thessalonikē (Greece)--Church history--Congresses.