The flag was created by the Esperanto Club of Boulogne-sur-Mer, initially for their own use, but was adopted as the flag of the worldwide Esperanto movement by a decision of the first Universal Congress of Esperanto, which took place in 1905 in that town.
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On December 15, 2009, the Esperanto flag flew on the Google home search page "Google" logo to mark L.L. Zamenhof's 150th birthday.
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