Law Courts 195 of proof to be accepted was limited and the court was strict. The Court Customary was thus being weakened along two lines. Economic changes in the manor were so modifying society and the relations of lord and as to remove its raison d'etre; as it became less and less a source of income to the lord, he would cease to strive to maintain it. Secondly, the all-absorbing royal courts were ready to take advantage of every change which might be construed as adding to the ranks of freemen, and thus of possible litigants. There were other ways in which individual villeins became free in the later middle ages which it is unnecessary to discuss here. Only a glance at the changes which affected the whole class has been attempted. The Court Customary did not die suddenly; it was decadent at the end of the middle ages, but had some importance well into modern times. How- ever, the forces which were to bring it to an end have been seen in full operation in the fourteenth and fifteenth, centuries. With this court is completed the list of the older local courts which fell before the royal system. It remains now to finish the consideration of the attempts of that system to put into the localities something that could work in harmony with itself, and that could furnish. that local administration of justice which, in some form, is always necessary.1 It is essential to any judicial system that much criminal business be done quickly and on the spot. Frequent as judicial iters might become, the king would find it neces- sary to have resident criminal justices. From what has been said of the sheriff's tourn, it might seem that that was destined to meet this need. But hardly had the tourn come into existence before the king found that he must have something more and something different. The sheriff was too great a local, landed personage to be en- trusted with a power that would have to be extended in many directions as the peace-keeping and administrative 1 See above, pp. 180-182.