As to the immediate vassals of the king, they owed him,

First, a military service of forty days whenever it was required;
Secondly, pecuniary aid under three circumstances,—to ransom the king when made prisoner, to arm his eldest son as a knight, or to marry his eldest daughter. The amount of this aid was undetermined up to the reign of Edward I.; it was then fixed at twenty shillings for the fief of a knight, and as much for every twenty pounds sterling value in land held in socage tenure.
Thirdly, the king had a right to receive from his vassals a relief or fine on the death of the possessor of a fief; he was guardian if the heir were a minor, and enjoyed all the revenues of the fief till the majority of the heir; he also had a control over their marriages, that is to say, the vassal of a king could not marry without his consent. All these rights were indeterminate, and negotiations were substituted for them in which the greater force always had the advantage.
Fourthly, the dispensation from feudal military service gave rise to an impost termed escuage, a kind of ransom-money fixed arbitrarily by the king, as representative of a service to which he had a claim; and he even imposed it in many cases on his vassals when they would have preferred to serve in person. Henry II., by his purely arbitrary will, levied five escuages in the course of his reign.

In addition to these taxes levied by the king, another must be mentioned called the danegeld, or tax paid for defence against the Danes; this tax was raised several times during this period on all lands throughout the kingdom. The last example of it is to be found in the twentieth year of the reign of Henry II.

By means of these independent revenues and arbitrary taxes, the Norman kings constantly kept up bodies of paid troops, who could enable them to exercise their power without restraint, which did not take place till a considerably later period on the Continent.

Lastly, from William the Conqueror till Henry II. the judicial power tended always to concentrate itself in the hands of the king. In this last reign the work was very nearly accomplished: how this came to pass, I will endeavour to show.

Originally the jurisdictions that co-existed were as follows:

1. The courts of hundred and the county-courts, or meetings of the freeholders of these territorial subdivisions, under the presidency of the sheriff:
2. The courts-baron, or feudal jurisdictions:
3. The grand court of the king, where the king and the assembled barons administered justice to the barons in cases between any of themselves, or in cases of appeal, which could only take place when justice had been refused in the court of the manor or county.

The Court Of Exchequer.

The Court of Exchequer, instituted by William the Conqueror, was, at first, only a simple court for receiving the accounts of the administration of the king's revenues, and those of the sheriffs, bailiffs, &c., and for judging the suits that arose on this subject. It was composed of barons, chosen by the king to form his council, and to aid him in his government. In proportion as the larger assembly, the Curia regis, came to be held less frequently, so did the Court of Exchequer gain in importance. The barons who composed it began to judge on their own responsibility, and alone, in the absence and before the convocation of the assembly; this change was introduced by necessity, confirmed by custom, and finally sanctioned and established by law. About the year 1164, another royal court of justice, distinct from the Court of Exchequer, arose out of it, the members of which, however, were the same as those composing the Court of Exchequer. The kings lent their assistance to this change, because it benefited their revenues. At this period were established writs of chancery, which gave to purchasers the right to apply at once to the royal justice, without previously passing the subordinate courts of justice. Soon the ignorance of the freeholders, who composed the county-courts, necessitated the same extension of the royal justice there also, and, in the reign of Henry I., itinerant justices were sent into the counties, in order to administer there in the same way as was done by the Court of Exchequer. This institution was in full vigour only during the reign of Henry II.