1894 Esperanto reform project
In 1894, L. L. Zamenhof, who was the original creator of the constructed language Esperanto, proposed a complete series of reforms to Esperanto (in other words, an Esperantido). It is notable as the only complete Esperantido to be authored by Zamenhof himself, and it was presented in response to various reforms that had been proposed by others since the language's publication in 1887.
Source: Wikipedia — 1894 Esperanto reform project (CC BY-SA 4.0)