In the last year of the war she was accompanied into Guienne by the duc de Nemours, her intimacy with whom gave La Rochefoucauld an excuse for abandoning her, and who himself immediately returned to his old mistress the duchesse de Chevreuse.
He was mixed up with the sordid intrigues which preceded the deposition of Edward II., and supplied Queen Isabella and Mortimer in Paris with money in 1325 from the revenues of Guienne, of which province he was treasurer.
A treaty with the English which secured the district of Agenais for France was followed by a feudal war in Guienne.
His son, Robert II., took part in the wars in Navarre, Sicily, Guienne and Flanders, and was killed at the battle of Courtrai in 1302.
In 1789 Armagnac was a province forming part of the Gouvernement-general of Guienne and Gascony; it was divided into two parts, High or White Armagnac, with Auch for capital, and Low or Black Armagnac. At the Revolution the whole of the original Armagnac was included in the department of Gers.