Shortly after he came into possession of large estates left by Catherine de' Medici, from one of which he took his title of count of Auvergne.
The conspiracy was discovered; Biron and Auvergne were arrested and Biron was executed.
Auvergne after a few months' imprisonment was released, chiefly through the influence of his half-sister, his aunt, the duchess of Angouleme and his father-in-law.
Auvergne remained in the Bastille for eleven years, from 1605 to 1616.
A decree of the parlement (1606), obtained by Marguerite de Valois, deprived him of nearly all his possessions, including Auvergne, though he still retained the title.