Léon Bollack

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Léon Bollack
Born 1859
Died 1925
Occupation trader
Known for Inventor of Bolak

Léon Bollack (1859 – 1925) was a rich French trader who created The Blue Language or Bolak in 1899. After a few years, he joined the Ido movement; it is possible that the blue color of the Ido flag was his proposal. He uttered the phrase: "It seems to me that both the Esperanto and Volapük poets are worthy only to be the objects of ridicule."

Bollack inspired H.G. Wells who mentioned him in his book A Modern Utopia. He died in 1925.



  • La Langue Bleue Bolak: langue internationale pratique, Paris: 1899 (480+ p.).
  • Abridged grammar of the Blue Language [translated by Tischer], Paris: Pres. Dupont, 1900 (64 p.).
  • Premier vocabulaire de la langue bleue Bolak, Paris: 1902 (90+ p.).
    • Comment tuer la guerre - La loi mondiale de boycottage douanier. Rapport ... Paris, 1912.
  • L'emploi rationnel de la plume des oiseaux sauvages. Réglementation, oui ; prohibition, non.. Publ. du. Comite d’Ornithologie Economique, 1914.


  • La Langue Française en l'an 2003, par Leon Bollack, in La Revue, 15 Juillet, 1903.