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The only real official in the Shire at this date was the Mayor of Michel Delving (or of the Shire), who was elected every seven years at the Free Fair on the White Downs at the Lithe, that is at Midsummer. As mayor almost his only duty was to preside at banquets, given on the Shire-holidays, which occurred at frequent intervals. But the offices of Postmaster and First Shirriff were attached to the mayoralty, so that he managed both the Messenger Service and the Watch. These
were the only Shire-services, and the Messengers were the most numerous, and much the busier of the two. By no means all Hobbits were lettered, but those who were wrote constantly to all their friends (and a selection of their relations) who lived further off than an afternoon’s walk.
The Shirriffs was the name that the Hobbits gave to their police, or the nearest equivalent that they possessed. They had, of course, no uniforms (such things being quite unknown), only a feather in their caps; and they were in practice rather haywards than policemen, more concerned with the strayings of beasts than of people. There were in all the Shire
only twelve of them, three in each Farthing, for Inside Work. A rather larger body, varying at need, was employed to ‘beat the bounds’, and to see that Outsiders of any kind, great or small, did not make themselves a nuisance.
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J.R.R. Tolkien (The Lord of the Rings)