Columbia subject headings:
Harvard subject headings:
English--Germany--Palatinate--History--To 1500.
Isabella, Empress, consort of Frederick II, Holy Roman Emperor, 1214-1241.
Matilda, Empress, consort of Henry V, Holy Roman Emperor, 1102-1167
Nobility--England--Biography.
Nobility--England--History--To 1500.
Richard I, King of England, 1157-1199.
Richard, King of the Romans, 1209-1272.
Princeton subject headings:
English--Germany--Palatinate--History--To 1500.
Isabella, Empress, consort of Frederick II, Holy Roman Emperor, 1214-1241.
Matilda, Empress, consort of Henry V, Holy Roman Emperor, 1102-1167.
Nobility--England--Biography.
Nobility--England--History--To 1500.
Richard I, King of England, 1157-1199.
Richard, King of the Romans, 1209-1272.