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Gyllenstiern was a man, described as incredibly fat and rather shifty, hailing from the city of Hengfors who served King Niedamir as Caingorn's chancellor.
Gyllenstiern accompanied King Niedamir on a dragon-hunting expedition to Barefield.
- His name is most probably a reference to Shakespeare's Hamlet, in which Guildenstern is one of two friends of the titular hero.