It is no disparagement to Magna Carta, then, to confess that part of its power has been read into it by later generations, and lies in the halo, almost of romance, which has gradually gathered round it in the course of centuries. It became a battle cry for future ages, a banner, a rallying point, a stimulus to the imagination. For a king, thereafter, openly to infringe the promises contained in the Great Charter, was to challenge the bitterness of public opinion—to put himself palpably in the wrong. For an aggrieved man, however humble, to base his rights upon its terms was to enlist the warm sympathy of all. Time and again, from the Barons’ War against Henry III. to the days of John Hampden and Oliver Cromwell, the possibility of appealing to the words of Magna Carta has afforded a practical ground for opposition; an easily intelligible principle to fight for; a fortified position to hold against the enemies of the national freedom. The exact way in which this particular document—dry as its details at first sight may seem—has, when considered as a whole, fired the popular imagination, is difficult to determine. Such a task lies rather within the sphere of the student of psychology than of the student of history, as usually conceived. However difficult it may be to explain this phenomenon, there is no doubt of its existence. The importance of the Great Charter, originally flowing both from the intrinsic and from the extrinsic features already described, has greatly increased, as traditions, associations, and aspirations have clustered more thickly round it. These have augmented in each succeeding age the reverence in which it has been held, and have made ever more secure its hold upon the popular imagination. Thus Magna Carta, in addition to its legal value, has a political value of an equally emphatic kind. Apart from and beyond the salutary effect of the many useful laws it contained, its moral influence has contributed to a marked advance of the national spirit, and therefore of the national liberties. A few of the aspects of this advance deserve to be emphasized. The King, by granting the Charter in solemn form, admitted that he was not an absolute ruler—admitted that he had a master over him in the laws which he had often violated, but which he now swore to obey. Magna Carta has thus been truly said to enunciate and inaugurate “the reign of law” or “the rule of law” in the phrase made famous by Professor Dicey.[222] ----- Footnote 222: A. V. Dicey, _Law of the Constitution_, Part II. -----