Which Tolkien novel features the dragon Chrysophylax Dives?

Farmer Giles of Ham features the dragon Chrysophylax Dives.

Farmer Giles of Ham is a comic medieval-style story by J.R.R. Tolkien, first published in 1949. Its hero is Farmer Giles, an ordinary landowner in the fictional English kingdom of the Middle Kingdom. After an accidental encounter with a giant, Giles becomes celebrated as a dragon-fighter even though he is not a conventional knight.

The dragon he confronts is Chrysophylax Dives, whose Latin-derived name suggests wealth and a love of treasure. The story humorously reverses the expected heroic pattern: Giles relies on practical judgment and local knowledge rather than courtly training.

The book is separate from Middle-earth and is not part of The Hobbit or The Lord of the Rings. Tolkien’s shorter works often use mock-medieval language, folklore, and English landscape settings without belonging to his main legendarium.