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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.
In 1977, the Director-General visited the Universal Congress of Esperanto in Reykjavík, Iceland and in 1985, UNESCO passed a further resolution recommending that member countries encourage the teaching of Esperanto.