The second treaty of the Peace of Basel (22 July 1795) brought the war between Spain and France to an end. In order to regain his political security and to demonstrate his support for the Royalist cause, d'Antraigues transferred from the Spanish to the Russian legation at Venice. In doing so, he became the link between Louis XVIII and Catherine the Great, and – simultaneously – gained Russian protection for himself by virtue of being an attaché at the Russian legation. The move was facilitated by Las Casas, who introduced him to the Russian ambassador at Naples: the ambassador then recommended him to the Empress Catherine. Letters written by Las Casas and quoted by de Goncourt indicate that, whilst in Venice, Saint-Huberty attended the opera from time to time, and was also invited to private musical gatherings. In April 1795 the Republican Paris newspaper "L'instituteur national" carried a report that "Monsieur" (i.e. Louis XVIII in exile) had conferred the sash of Saint-Michel to Saint-Huberty for her services to music, and she now wore it ostentatiously whenever she was at the theatre or out walking. The writer also drew attention to the now common rumour that d'Antraigues, with whom she was living, had married her.