James Boswell died in 1795 believing he had touched and kissed a cache of Shakespeare's original letters and papers discovered by a Mr. Ireland. His friend, Edmond Malone, publicly exposed the lot as a forgery just a year later.
Friedrich Karl von Forster
Sometime (until 1763 or 1764) chamberlain and privy counsellor of legation at the court of Saxe-Gotha and from March 1, 1764 chief steward of that court.1
Life with Boswell:
Note 1: Only source for this biography is The Journal of his German and Swiss Travels, 1764.