She first took the profession of
courtesan under the title of Mademoiselle Lange, of whom she had
Louis François Armand du Plessis, duc de Richelieu as recurrent client. Jean du Barry, however, saw her as a means of influence with
Louis XV, who became aware of her in
1768. Marie-Jeanne, however, could not qualify as an official royal mistress unless she had a title; this was solved by her marriage to Du Barry's brother, Comte Guillaume du Barry, in
1769. She was presented to the King's family and the court on
April 2, 1769. And so, followed by her Indian page Zamor and wearing extravagant gowns of great proportions both in size and cost, and diamonds covering her delicate neck and ears, she was now
maitresse declaree to
Louis XV.
While she was part of the faction that brought down
Duke of Choiseul, Minister of foreign affairs, she was unlike her late predecessor
Madame de Pompadour in that she had little political influence upon the king.
While known for her good nature and support of artists, the King's financial extravagance towards her was the source of increasing unpopularity. Her relationship with
Marie Antoinette, the Dauphine of France, was contentious. The Dauphine supported
Choiseul as the proponent of the alliance with
Austria and also defied court protocol by refusing to speak to Madame Du Barry, due to her feelings about the latter's background. It had to be a long time after during a ball when Marie Antoinette, forced in doing so, said to her "there are a lot of people at Versailles!", which then broke the boundaries which were set by protocol in which du Barry was not allowed to speak to Antoinette before the latter said the first words to the former. She was reportedly 'christened' "La du Barry" by the Dauphine.
At the king's request before his death in May
1774, she was banished from the court to the convent of Pont-au-Dames, as her amoral presence would have prevented the king from receiving
absolution. Two years later she moved to her famous
Château de Louveciennes, where she continued her career as a
courtesan, having relationships with both
Henry Seymour and the Louis Hercule Timolon de Cossé,
Duke of Brissac.