Pyrites

Mentioned in Troll Bridge as Beryl's uncle, Pyrites owns a large wooden bridge, commonly used by merchants, although he collects a toll on this bridge rather than continuing the more ancient traditions of trolling preferred by his nephew, Mica.
According to Beryl, Mica should have gone in with him when he had the chance...but he says he would rather eat worms.

Annotations

On Roundworld, pyrite is another name for Fool's Gold.