Nope, Benedict Cumberbatch was not in A Knight's Tale. I checked out his website and IMDB page and the movie wasn't listed on either.
I'm pretty sure it would have been, even if he only played a minor rule... Unless he was ashamed of being in that movie (some people think it wasn't very good).
Benedict Cumberbatch is not in A Knight's Tale.
I know you're not getting mixed up with Heath Ledger, because the two look distinctly different. But I wonder whether you could be getting mixed up with James Purefoy, who plays Edward the Black Prince in A Knight's Tale.
Here's a set of picture of both Benedict Cumberbatch and James Purefoy:
Looking at them, you can see some similarities, but i can assure you only one of them came anywhere near the set of A Knight's Tale, and it sure wasn't Benedict Cumberbatch.
When A Knight's Tale was being filmed, he was probably busy working on the TV movie Fields of Gold.
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