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Who created Esperanto and when?

Esperanto was created by L.L. Zamenhof, a Polish ophthalmologist. He published the first Esperanto textbook, Unua Libro, on July 26, 1887. In 1905 Zamenhof published the book Fundamento de Esperanto as a definitive guide to the language, and the World Esperanto Congress was organized for the first time that same year.