*11. Beginnings of the Representative Principle.*--The thirteenth century was clearly one of the most important periods in the growth of the English constitution. It was marked not merely by the contest which culminated in the grant of the Great Charter but also by the beginnings, in its essentials, of Parliament. The formative epoch in the history of Parliament may be said to have been, more precisely, the second half of the reign of Henry III. (1216-1272), together with the reign of the legislator-king Edward I. (1272-1307). The creation of Parliament as we know it came about through the signal enlargement of the Norman-Plantagenet Great Council by the introduction of representative elements, followed by the splitting of the heterogeneous mass of members definitely into two co-ordinate chambers. The representative principle was in England no new thing in the thirteenth century. As has appeared, there were important manifestations of it in the local governmental system of Anglo-Saxon times. As brought to bear in the development of Parliament, however, the principle is generally understood to have sprung from the twelfth-century practice of electing assessors to fix the value of real and personal property for purposes of taxation, and of jurors to present criminal matters before the king's justices. Thus, Henry II.'s Saladin Tithe of 1188--the first national imposition upon incomes and movable property--was assessed, at least in part, by juries of neighbors elected by, and in a sense representative of, the taxpayers of the various parishes. By the opening of the thirteenth century the idea was fast taking hold upon the minds of Englishmen, not only that the taxpayer ought to have a voice in the levying of taxes, but that between representation and taxation there was a certain natural and inevitable connection. In the Great Charter, as has been stated, it was stipulated that in the assessment of scutages and of all save the three commonly recognized feudal aids the king should seek the advice of the General Council. The General Council of the earlier thirteenth century was not regularly a representative body, but it was not beyond the range of possibility to impart to it a representative character, and in point of fact that is precisely what was done. To facilitate the process of taxation it was found expedient by the central authorities to carry over into the domain of national affairs that principle of popular representation which already was doing approved service within the sphere of local justice and finance, and from this adaptation arose, step by step, the conversion of the old gathering of feudal magnates into a national parliamentary assembly.