The Declaration of Boulogne (Bulonja Deklaracio) was a document written by L. L. Zamenhof and endorsed by the attendees of the first world congress of Esperanto in Boulogne-sur-Mer, France in 1905.
On December 15, 2009, the Esperanto flag flew on the Google home search page "Google" logo to mark L.L. Zamenhof's 150th birthday.
Zamenhof proposed using the pronoun ĝi (literally "it").
The group of Warsaw was found by L. L. Zamenhof, who was working on the first grammar of Yiddish ever written, published under the pseudonym "Dr. X" only in 1909, in Lebn un visnshaft, in the article "Vegn a yidisher gramatik un reform in der yidisher shprakh".
In 1910, O'Grady and three other MPs, along with Professor Stanley Poole, formally nominated for the Nobel Peace Prize the Polish physician L. L. Zamenhof, inventor of Esperanto.
Author of Zamenhof: Creator of Esperanto — a biography of L. L. Zamenhof published in 1960 by Routledge & Kegan Paul of London — she also wrote a widely used series of introductory texts on literary studies: The Anatomy of Poetry (1953), The Anatomy of Prose (1954), The Anatomy of Drama (1960), The Anatomy of Language (1968), The Anatomy of the Novel (1975) and The Anatomy of Literary Studies (1980).
The name Zlango is a combination of lingo, slang, and language, with the letter Z as homage to Esperanto creator L. L. Zamenhof.