Columbia subject headings:
Catholic Church--Bishops--Biography.
Catholic Church. Archdiocese of Cologne (Germany)--History.
Germany--Church history--843-1517.
Germany--History--Hohenstaufen, 1138-1254.
Philipp, von Heinsberg, -1191.
Harvard subject headings:
Catholic Church--Bishops--Biography.
Catholic Church. Archdiocese of Cologne (Germany)--History.
Germany--Church history--843-1517.
Germany--History--Hohenstaufen, 1138-1254.
Philipp, von Heinsberg, -1191.
Princeton subject headings:
Germany--History--843-1273.
Philipp, von Heinsberg, -1191.