 In April 1813 he was made a duke, and on 3 November that year he married Marie-Rose Rosine Clary of the influential Clary family, she was the cousin by birth of Julie Clary.Marie-Rose had previously been married to General Saligny until the latter's death in 1809.Through marriage Dècres became brother-in-law to Marshal Suchet, and nephew of both Marshal Bernadotte and Joseph Bonaparte.