Columbia subject headings:
Harvard subject headings:
Roman provinces--Administration--Congresses.
Roman provinces--Congresses.
Rome--Antiquities--Congresses.
Rome--Colonies--Administration--Congresses.
Rome--Colonies--Antiquities--Congresses.
Rome--Colonies--Congresses.
Princeton subject headings:
Wales--Antiquities, Roman--Congresses.
Wales--History--1063-1536--Congresses.