 For many years Leblanc was the lover of Belgian playwright and writer Maurice Maeterlinck, and he wrote several parts for her within his stage plays.She portrayed the role of Ariane in "Ariane et Barbe-bleue", both in the original 1899 stage play by Maeterlinck and in the 1907 opera adaptation by Paul Dukas.Leblanc also appeared in a couple of French films, most notably "L'Inhumaine" in 1924.