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He decided no good candidate language existed, so set out to invent a new one, ultimately based on his knowledge of Russian, Yiddish (natively spoken); Polish, German, French, Hebrew, Belarusian, English, Volapük (acquired); and Latin, Greek, Aramaic (studied academically). Zamenhof began work on his international language no later than 1878, and first publicized it in 1887 under the pseudonym Dr.