Famously, in The Undiscovered Country has this line by Chancellor Gorkon, in response to Spock quoting Hamlet:
You have not experienced Shakespeare until you have read him in the original Klingon.
In fiction, there's a 'definite' answer here depending on how trustworthy you think the Klingons are...
But knowing that Shakespeare's Hamlet is inspired by the legend of Amleth of scandinavian origin, first recorded in the 12th century (in Chronicon Lethrense) and later by Saxo Grammaticus in the 13th century made me wonder if David Warner, who was a member of the Royal Shakespeare company was aware of this, and read either Chronicon Lethrense, or Saxo Grammaticus' version in Gesta Danorum?
So 'original klingon' is actually 'original danish', if not where did the line come from - Warner himself or someone else?