What is Louis Jean Marie de Bourbon, Duke of Penthièvre?
{{Use dmy dates|date=February 2018}} {{Infobox royalty |name=Louis Jean Marie de Bourbon |title=Duke of Penthièvre |image=Nattier L J M de Bourbon duc de Penthievre.jpg |caption= Penthièvre by Nattier |full name=Louis Jean Marie de Bourbon |spouse=[[Maria Teresa Felicitas d'Este]] |issue=Louis Marie, Duke of Rambouillet<br>Jean Marie, Duke of Châteauvillain<br>Vincent, Count of Guingamp<br>[[Louis Alexandre, Prince of Lamballe]]<br>Marie Louise, Mademoiselle de Penthièvre<br>[[Louise Marie Adélaïde de Bourbon|Marie Adélaïde, Duchess of Orléans]] |issue-link=#Marriage and children |royal house=[[House of Bourbon]] |father=[[Louis Alexandre, Count of Toulouse]] |mother=[[House of Noailles|Marie Victoire de Noailles]] |birth_date={{Birth date|1725|11|16||df=y}} |birth_place=''Château de Rambouillet'', [[France]] |death_date={{Death date and age|1793|3|4|1725|11|16|df=y}} |death_place=''Château de Bizy'', France |burial_place=[[Royal Chapel of Dreux|Royal Chapel]], Dreux, France | religion = [[Roman Catholicism]] |signature=Signature of Louis Jean Marie de Bourbon, Duke of Penthièvre at the baptism of the Duke of Berry, son of the Count and Countess of Artois (August 1785).png |}} '''Louis Jean Marie de Bourbon''' (16 November 1725 – 4 March 1793) was the son of Louis Alexandre de Bourbon and his wife Marie Victoire de Noailles.<ref>Dumont de Montigny, ''The Memoir of Lieutenant Dumont, 1715-1747: A Sojourner in the French Atlantic'' (Chapel Hill: University of North Carolina Press, 2012), p. 435</ref> He was also a grandson of [[Louis XIV of France]] and his mistress, [[Madame de Montespan]]. From birth he was known as the [[Duke]] of Penthièvre. He also possessed many titles inherited from his father and was the richest man in [[France]] during his lifetime. He was later the father in law of [[Philippe Égalité]]. Though his fsther was an illegitimate son of a king the young duke was still known as and given the rank of a [[Prince du Sang|Prince of the blood]]. A majority of his vast fortune had been inher