The word "shire," which is probably derived, like "shear" and "share," from an Anglo-Saxon root meaning "to cut," was at one time used in a wider sense than it is at present, and was formerly applied to a division of a county or even of a town. Thus, there were once six small "shires" in Cornwall.

The word shire was in use at the time of King Ina, and occurs in the code of laws which that monarch drew up about the year 709; but the actual division of England into shires was a gradual process, and was not complete at the Norman Conquest. Lancashire, for example, was not constituted a shire until the twelfth century. Alterations in the extent and limits of some of the counties are, indeed, still being made; and in the case of Devonshire the boundaries have been changed several times within the memory of persons still living.

The object of thus dividing up the country was partly military and partly financial. Every shire was bound to provide a certain number of armed men to fight the king's battles, and was also bound to contribute a certain sum of money towards his income and the expenses of the state; and in each district a "shire-reeve"—or sheriff, as we call the officer now—was appointed by the Crown to see that the people did their duty in both respects. The shire was a Saxon institution. County is a Norman word, which came into use after the Conquest, when the government of each shire was entrusted to some powerful noble, often a count, a title which originally meant a companion of the King.

It has been suggested that the reason why the names of some counties end or may end in "shire," while in other cases this syllable is never used, is that the former were "shorn off" from some larger district, while the latter represent entire ancient kingdoms or tribal divisions. According to this theory, Yorkshire is a "shire" because it originally formed part of the kingdom of Northumbria; and Kent is not a "shire" because it practically represents the ancient kingdom of the Cantii. The form "Kent-shire" is, however, found in a record of the time of Athelstan.

In the case of our own county both forms are in use, and we say either "Devon" or "Devonshire," although the two names are not exactly interchangeable. Thus, while we generally talk of "Red Devon" cattle, we always speak of "Devonshire" cream. "Devon," which is the older form, may be derived either from Dumnonii, the name given by Ptolemy, an Alexandrian geographer of the second century, to the inhabitants of the south-west of Britain, perhaps from a Celtic word Dumnos, "people"—or it may come from the old Welsh word Dyvnaint or Dyfneint, "the land of the deeps," that is to say, of deep valleys or deep seas. To the Saxon settlers the people they found in possession of the district were Defn-saetan or "dwellers in Devon"; and in time these settlers called themselves Defenas, or "men of Devon." In the Exeter Domesday Book—the Norman survey of the five south-western counties, completed probably before 1086—the name of the county is given as Devenesira. It would appear, then, that the Britons called their province "Devon," and that the Saxons called it "Devonshire." It is characteristic of the peaceable nature of the Saxon occupation that the two names, like the two nations, seem to have quietly settled down side by side.

Devonshire in the Exeter Domesday Book

It is believed that it was Alfred the Great who marked out the border-line between Devon and Somerset; and it was undoubtedly Athelstan who, after his victory over the West Welsh, made the Tamar the boundary between Devon and Cornwall.