Apart from the wholly rural portions, which constitute its bulk, Domesday contains entries of interest concerning most of the towns, which were probably made because of their bearing on the fiscal rights of the crown therein. These include fragments of custumals, records of the military service due, of markets, mints, and so forth. From the towns, from the counties as wholes, and from many of its ancient lordships, the crown was entitled to archaic dues in kind, such as honey. The information of most general interest found in the great record is that on political, personal, ecclesiastical and social history, which only occurs sporadically and, as it were, by accident. Much of this was used by E. A. Freeman for his work on the Norman Conquest. Although unique in character and of priceless value to the student, Domesday will be found disappointing and largely unintelligible to any but the specialist. Even scholars are unable to explain portions of its language and of its system. This is partly due to its very early date, which has placed between it and later records a gulf that is hard to bridge.
But in the _Dialogus de scaccario_ (_temp._ Hen. II.) it is spoken of as a record from the arbitrament of which there was no appeal (from which its popular name of "Domesday" is said to be derived). In the middle ages its evidence was frequently invoked in the law-courts; and even now there are certain cases in which appeal is made to its testimony. To the topographer, as to the genealogist, its evidence is of primary importance; for it not only contains the earliest survey of a township or manor, but affords in the majority of cases the clue to its subsequent descent. The rearrangement, on a feudal basis, of the original returns (as described above) enabled the Conqueror and his officers to see with ease the extent of a baron's possessions; but it also had the effect of showing how far he had enfeoffed "under-tenants," and who those under-tenants were. This was of great importance to William, not only for military reasons, but also because of his firm resolve to make the under-tenants (though the "men" of their lords) swear allegiance directly to himself. As Domesday normally records only the Christian name of an under-tenant, it is vain to seek for the surnames of families claiming a Norman origin; but much has been and is still being done to identify the under-tenants, the great bulk of whom bear foreign names.