His brother Alexandre, vicomte de Beauharnais, married Josephine Tascher de la Pagerie (afterwards the wife of Napoleon Bonaparte) and had two children by her - Eugene de Beauharnais and Hortense, who married Louis Bonaparte, king of Holland, and became mother of Napoleon III.
In 1802 the First Consul married him to Hortense Beauharnais, a forced union which led to most deplorable results.
At the close of the year Louis went to Paris, partly in order to procure a divorce from Hortense and partly to gain better terms for Holland.
Meanwhile the Countess Potocka had established herself in Paris, but Charles de Flahaut had by this time entered on his liaison with Hortense de Beauharnais, queen of Holland.
He was assiduous in his attendance on Queen Hortense until the Hundred Days brought him into active service again.