Columbia subject headings:
Great Britain--Politics and government--1154-1399.
Messengers--Great Britain--Registers.
Royal households--Great Britain.
Harvard subject headings:
Civilization, Medieval--Sources
Great Britain--History--Edward I, 1272-1307--Sources.
Great Britain--History--Edward II, 1307-1327--Sources.
Great Britain--History--Edward III, 1327-1377--Sources.
Great Britain--History--Henry III, 1216-1272--Sources.
Great Britain--History--John, 1199-1216--Sources.
Messengers--England--History--Sources.
Messengers--England--Registers.
Princeton subject headings:
Great Britain--History--1066-1687--Sources.
Great Britain--History--John, 1199-1216--Sources.
Messengers--England--History.
Royal households--England--History.