Memoirs of Duc de Saint-Simon, 1710-1715: The Bastards Triumphant.

Saint Simon kept a journal during the 30 plus years he was a peer at the French court. He spent his retirement writing his memoirs, a first-hand account of the train-wreck that eventually lead to the French Revolution. When he died, his memoirs were confiscated by order of the King. The French government did not release them until 1830. Many of Saint-Simon's letters are possibly still being held.