Jethro Jefferson is the smith of the village near to Ramkin Hall who rather foolishly decides to vent his anger with the local authorities in a bout of fisticuffs with Samuel Vimes where he comes close to adding to the list of men who have the words 'refused Fantailler' on their tombstones. In possession of a hot temper, he quickly cools off. After illegally being sent on a holiday in the sun by the cronies of the local magistrates, he is recovered by Vimes and joins the Shires force under Chief Constable Upshot. He seems to have an understanding with Miss Felicity Beedle.
Appears in Snuff.