Columbia subject headings:
Catholic Church--Germany--Mainz (Rhineland-Palatinate)--Bishops--Biography.
Catholic Church. Archdiocese of Mainz (Rhineland-Palatinate, Germany)--History.
Holy Roman Empire--History--Saxon House, 919-1024.
Mainz (Rhineland-Palatinate, Germany)--Church history.
Willigis, Archbishop of Mainz, -1011.
Harvard subject headings:
Bishops--Germany--Mainz--Biography.
Germany--History--Saxon House, 919-1024.
Willigis, Saint, Archbishop of Mainz, -1011.
Princeton subject headings: