Norman Institutions. 911-1066 79 Saxon feudalism, while the economic side is much the more important, it is impossible to distinguish so clearly between the political and economic aspects. The dis- tinguishing traits of the political feudalism, found in Norc/mdy as elsewhere in Prance in the eleventh cen- tury, and which was brought into England by the Norman Conquest, may be summarised. They related to a part of society held together by a nexus of private contracts. The relation of lord and vassal, whatever was the expecta- tion based upon inheritance of the fief, was in theory and usually in practice, wholly voluntary, freely entered into on both sides, and solemnised by the ceremony of homage. It involved such negative duties on the part of the vassal as not to attack his lord, reveal his secret, endanger his castle, diminish his judicial power, or hinder any of his undertakings; and positively to render him counsel and aid, usually in the form of attending his feudal court, and of course, as the main condition upon which the fief was held, a fixed yearly amount of military service.1 The obligations of the lord, protection, backing, and a like personal fidelity, while not so easy to particularise, were equally binding. As between lord and vassal, the better right to the fief was with the lord, evidenced by the reversion of the fief to the lord at the vassal's death and the payment of relief when taken up by the new vassal. We hear little of best right, of ownership; in land tenure all was relative, not absolute; all up and down the scale, everybody held land of some one. Attached to this nexus of private contracts based on landholding were public duties—the chief ones of those times, the levying of a military force and the holding of courts of law. The amount of jurisdictional power possessed by the different grades of nobles varied greatly, but public courts, as such, whether central or local, had practically disappeared. Criminal jurisdiction, especially in the more serious cases, 1 The service might be some other than knight service provided it were such as a noble could perform without tarnishing his nobility, but knight service was so much the rule that the other forms were negligible.