Law Courts 193 It has been seen that the outward mark of unfreedom in the case of the villein was that he could not bring an action in the king's courts, and that these courts came to their conclusion upon an individual's status by ascertaining the degree of uncertainty in his service. * Two changes/ which began in the thirteenth century, so fundamentally modified manorial conditions in the two following centuries as to do away with this uncertainty of service. The first was the commutation of payments in kind and labour to pay- ments in money. The increasing use of money as a med- ium of exchange made it possible for the lord to give something for labour other than land, and for the tenant to give something for land other than labour. A man could leave the manor with some chance of placing him- self more advantageously elsewhere; at least, he could sell his labour where he could get the most for it. This tended to break up the manorial economy and to make labour free. Fugitives from manors increased; and such fugi- tives, if no proofs were brought to the contrary, were always accounted free before the king's courts.3 This rise in the position of the servile classes was favoured by the Black Death of 1348, which, for a time, placed the peasantry upon the right side of the labour market, and possibly to a slight extent by the peasant revolt of 1381. The growth of copyhold tenure was a partial reflection of this change.4 This tenure certainly looked toward that definiteness in the kind of service to be rendered from day to day which was the touchstone of the royal courts 1 See above, pp. 94, 95. * These changes were caused mainly by economic and social forces that can not be considered here. See Cheyney, The Disappearance of English Serfdom, The English Historical Review, xv., 20-37; Page, The End of Villainage in England; Gray, The Commutation of Villein Services in Eng- land Before the Black Death, English Historical"Review, xxix., 625-656; and for some illustrative documents, W. and N., Problem IV. (A Fourteenth- Century Labor Problem). * See Frances G. Davenport, The Economic Development of a Norfolk Manor, 1086-1565. * In copyhold tenure, instead of the service being based upon the mem- ory of man, an entry of the service was made upon the manor roll, and ordi- narily a copy of this, in the nature of an indenture was placed in the hands of the peasant.