Columbia subject headings:
Great Britain--History--Angevin period, 1154-1216.
Pembroke, William Marshal, Earl of, 1144?-1219.
Harvard subject headings:
Chivalry
Great Britain--History--Angevin period, 1154-1216
Knights and knighthood--Great Britain--History.
Pembroke, William Marshal, Earl of, 1144?-1219.
Regents--Great Britain--Biography.
Princeton subject headings:
Great Britain--History--Angevin period, 1154-1216.
Pembroke, William Marshal, Earl of, 1144?-1219.