 Non-noble by birth, Abel-François Poisson de Vandières was raised in a family of Parisian financiers.When his elder sister, Jeanne-Antoinette Poisson became, in 1745, the official mistress of Louis XV and was given the title "marquise de Pompadour", she had him follow her to the court, where the young man attracted the favours of the king.When Philibert Orry retired, the king arranged for Abel-François Poisson de Vandières - then aged 18 - to inherit the direction of the Bâtiments du Roi ("direction générale des Bâtiments, Arts, Jardins et Manufactures"), while Charles François Paul Le Normant de Tournehem, believed to be the marquise de Pompadour's biological father, was named as Orry's immediate successor.