Columbia subject headings:
Baldwin, Count of Luxemburg, Archbishop of Trier, 1285-1354.
Feudalism--Germany--Trier.
Trier (Germany)--History.
Harvard subject headings:
Feudalism.
Trier (Germany)--History.
Princeton subject headings:
Balduin, Archbishop of Treves, 1285-1354.
Feudalism--Germany (West)--Trier.
Trier (Germany)--History.