Axel Fersen, planned and financed the ill fated flight to Varennes. He was a Swedish Count, and minister to the King, I believe he rose highly in the Swedish King, to Grand Marshal of the Kingdom. He also never forgot 16 Oct 1789. He writes about it in his diary each passing year, undoubtedly Marie Antoinette was the love of his life.
On the sudden death of the heir apparent he was mistakenly believed to have poisoned him, and at his funeral on the 20 June 1810, Fersen was attacked by a mob and beaten to death. The heir was not poisoned, and died of an apoplectic attack. He never recovered the funds promised him from helping the King & Queen
escape France, however he did see Madame Royale in Vienna once if not twice, but the Hapsburgs did not want him near the Princess.