Columbia subject headings:
Catholic Church. Diocese of Mainz--History--14th century.
Catholic Church. Diocese of Mainz--History--15th century.
Chapters, Cathedral, collegiate, etc.--Germany--Mainz (Rhineland-Palatinate)
Harvard subject headings:
Church history--Middle Ages, 600-1500
Mainz (Rhineland-Palatinate, Germany)--Church history.
Mainzer Dom. Chapter--History.
Princeton subject headings: