288 A BRIEF SURVEY OF HUMAN HISTORY compulsory service in the master's demesne and other obligations such as aids, reliej, etc. The contributions that the vassal was called upon to make to- wards the expenses of the marriage of the lord's daughter, or the accession to knighthood of the lord's son, constituted the " aids " ; the fee that was to be paid by a tenant's heir for succession to the fief comprised the " relief." Besides these the vassal's holding was liable to escheat on failure of heirs or forfeiture for disloyal conduct. If the lord was taken captive in war by an enemy his vassals were to pay ransom for his release. When so required the tenants with their retainers were to render military service being fully equipped at their own cost. In short, the tenant was to be his land- lord's man : he was to live, work, and die for his master in return for such justice, protection, and privileges as the times and the tenure guaranteed to him. In the absence! of any effective central government, justice was administered by the feudal (from feud=fief) lord in his manorial court. The manor was his estate. On it stood his great castle or fortified residence. The surrounding lands were held by his tenants or subtenants. The former held from him directly; the latter through their intermediate superiors. Below all were the serfs and slaves who, indeed, formed the major portion of the population. The serfs were superior to the slaves, and were attached to the soil They could not be killed or alienated with impunity. Lands were given to them for cultivation on very exacting terms. They could not forsake their farms and run away ; but if they did and were not discovered for a year gnd a day they were free. They were to work on their master's farm for three days in the week throughout the year, except during Christmas, Easter, and Whitsuntide. Each serf was to give to his lord, in one typical case, ' one bushd of wheat, eighteen