[1][2][3][4][5] The évêque was a prominent figure at the royal court during the reign of King Louis XV.
Amongst others, he held the position of Maître ecclésiastique de la Chapelle du Roi (Ecclesiastical Master of the King’s Chapel) from 1732 until his death in 1760.
He was a major opponent of the Jansenists and presided at five assemblies of the clergy of Brittany in the years 1732, 1734, 1736, 1738 and 1740.
[9][10][11][12][3][13][5][14] In 1750, he bought the Hôtel Chanac de Pompadour and made it his residence in Paris.
However, as Abbé François Marie Tresvaux du Fraval (1782–1862) remarked: "Louis-Guy de Guérapin de Vauréal had the talent to write well, and since he was an ambassador, his dispatches were considered models in their field.