The time at which fixed regulations first distinguished Chivalry from every other order in the state cannot be precisely determined; certainly it was not before the eleventh century. Then, however, it is probable, that this was done more from a general sense of its necessity, and by slow and irregular degrees, than by any one law or agreement. Every thing in that age was confusion, and though the spirit of Chivalry had for its great object the restoration of order, it is not likely that its own primary efforts should be very regular, amid a chaos of contending interests and unbridled passions, which rendered general communication or association difficult, if not impossible. Each knight, in admitting another to the noble order of which he himself was a member, probably added some little formality, as he thought fit, till the mass of these customs collected by tradition formed the body of their ceremonial law. The first point required of the aspirants to Chivalry, in its earliest state, was certainly a solemn vow, "_To speak the truth, to succour the helpless and oppressed, and never to turn back from an enemy_."[10] This vow, combined with the solemn appeal to Heaven in witness thereof, was the foundation of Chivalry; but, at the same time, we find, that in all ages, only one class of people was eligible to furnish members to the institution; namely, the military class, or, in other words, the northern conquerors of the soil; for, with very few exceptions, the original inhabitants of Europe had been reduced to the condition of serfs, or slaves of the glebe. Some few, indeed, had held out till they forced the invaders to permit their being incorporated with themselves upon more equal terms; but this was very rare, and the _race rustique_, as it was called, though it furnished archers to the armies, was kept distinct from the military race by many a galling difference. This lower race, then, could not be invested with the honours of Chivalry; and one of the first provisions we find in any written form, respecting the institution of knighthood, is designed to mark this more particularly. _Ad militarem honorem nullus accedat qui non sit de genere militum_, says a decree of the twelfth century. We may therefore conclude that this was the first requisite, and the vow the first formality of Chivalry.