Henri Farman
Archdeacon also spoke Esperanto, which he learned in 1908. He wrote "Why I became an Esperanto speaker" ("Pourquoi je suis devenu espérantiste", Paris: Fayard, 1910, 265p.), prefaced by Henri Farman. He was elected president of "Société Française pour la Propagation de l'Espéranto" in 1925, he advocated that international language to the end of his life.