(1) The idea of a personal contract between the free warrior and his lord, by which the former places himself at the disposition of the latter and promises unlimited service, is one which occurs in many primitive societies and is peculiar to no one branch of the human race. Tacitus noticed, as one feature of German life in his time, the free war-band (_comitatus_) who lived in the house of their chief, followed him to battle, and thought it the last degree of infamy to return alive from the field on which he had fallen. The Merovingian kings maintained a bodyguard of this kind (_antrustions_). Under the Carolingians such followers appear in the host, in the royal household, in every branch of the administration. They are the most trusted agents of the King and possess considerable social consequence. They are called _vassi_, a name formerly applied to any kind of dependent, but now reserved for free men rendering free services to the King or some other lord, and subject to his jurisdiction. So valuableare these followers that, in the eighth and ninth centuries, the power of the great is largely measured by the number of _vassi_ whom they can put into the field. Various considerations suggested to Frankish rulers and nobles the expediency of endowing these followers with land, and of granting land to no tenant unless he would take the vassal's oath. Usually land was the only form of pay which the lord could give; and it always served as a material guarantee of faithful service, since it could be resumed whenever the vassal made default. In days when law and morality availed little as the sanctions of contracts, the landlord naturally desired to bind his tenant to him by a personal obligation; and there were obvious advantages in providing that every tenant should be liable to aid his lord with arms. The estates granted to vassals were known as benefices (_beneficia_); they foreshadowed the lay-fief of later times. But there are some distinctions to be drawn. The benefice was not _de jure_ heritable; it escheated on the death of either lord or tenant. The service was not measured with the same precision as in later times. The military duties of the beneficed vassal were not different in kind or degree from those of the ordinary freemen. Finally, the idea had not yet arisen that vassals were superior in status to the rest of the community. The importance of the vassal depended entirely on his wealth and his rank in the King's employ. Only in the old age of the Carolingian Empire, when the class of free landowners, acknowledging no lord, had been almost ground out of existence by official oppression and the intolerable burden of military service, was the burden of national defence thrown entirely upon vassals. Then, as the sole military class in the community, they acquired the consideration which, in early stages of social development, is the monopoly of those who are trained to arms.