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No, it doesn't seem to be in the Chaos Castle. But we're not just talking about the Chaos Castle. Sometimes it's mentioned that it's good to have a Thief anyway.
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Well, I was just saying in general, that Barbarians can only hire Barbarians, or something like that...
Added 4 minutes laterLeSHiJ-MaX;105461I played against a human opponent on an XL map. He bought a Thief((( He wasn't playing as Chaos, but he leveled up his Thief better than his main hero with all that running around. He leveled up a lot)))))). When he came to me with the Thief, he just surrendered))) He was quite the killer)))
In general, the most striking example of a Thief is probably Agroniel (Storm campaign), although her class is Bard, but she's basically a Thief, especially in the first 2-3 levels, although it depends on how you level her up...

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!