The lands of the "Comté de Dreux" (County of Dreux), had been given to the duc de Penthièvre by his cousin Louis XVI. In November 1783, after having sold to Louis XVI the château de Rambouillet and the immense rich-game forest attached to the estate - the latter being the main reason of the sale - Penthièvre transferred the nine bodies of his family (his parents, his wife and six of his seven children) from the 12th century Saint-Lubin church in the village of Rambouillet to the Collégiale Saint-Étienne de Dreux, where he himself was buried in March 1793. On November 1793, a revolutionary mob desecrated the family crypt and threw the ten bodies in a mass grave in the "Collégiale" cemetery ("cimetière des Chanoines"). In 1816, his daughter, Louise Marie Adélaïde de Bourbon, "duchesse douairière d'Orléans", had a new chapel built on the site of that grave, as the final resting place for the members of the "House of Bourbon-Toulouse-Penthièvre". After the accession to the throne of her son, Louis-Philippe, King of the French, the chapel was named Chapelle Royale de Dreux, and became the necropolis of the royal Orléans family. It contains the remains of 75 members of the Bourbon and Orléans families.