[407] Letter from Louvois to Saint-Mars, November 22, 1667 and March 1, 1673. “There is no great inconvenience,” writes Louvois to Saint-Mars, “in M. Fouquet’s knowing that the King has made war 011 the Dutch. So do not persuade yourself that you have been deficient in any way in giving him a book which has apprised him of this.”--Letter from Louvois to Saint-Mars, July 2, 1673. “I have received your letter of the 16th of this month, which requires no answer except to say that the King approves your informing M. Fouquet of the current news, according as his Majesty has already permitted you.”--Letter of April 25, 1678. CHAPTER XVII. Sudden and singular Arrival of Lauzun in Fouquet’s Room--The latter had known him formerly under the Name of the Marquis de Puyguilhem--Lauzun enumerates his Dignities and calls himself the King’s Cousin--Fouquet believes his Visitor mad--Portrait of Lauzun--His Adventures--His Arrival at Pignerol--He continues his Visits to Fouquet--The Stories he tells him--Noble Conduct of Louis XIV. towards Lauzun--Audacious Method employed by the latter to overhear a Conversation between Louis XIV. and Madame de Montespan--Difference between the Conduct of Lauzun and that of Fouquet--Lauzun’s Outbursts against Saint-Mars--Perplexity of the latter--Singular Mode of Surveillance to which he has recourse--Progressive amelioration of the Lot of the two Prisoners--They receive Permission to see each other--Arrival of Fouquet’s Daughter at Pignerol--Misunderstanding between Fouquet and Lauzun--Cause of this Misunderstanding.