In the market square of Białystok, in the 1860s and 1870s, a boy could hear four languages before breakfast — Polish, Russian, Yiddish and German — each one the badge of a community that feared or despised the others. Ludwik Lejzer Zamenhof, the son of a Jewish language teacher, grew up amid the town's quarrels and drew a startlingly literal conclusion: if humanity shared one neutral second language, the walls between peoples might fall. Most children who resolve to fix the world grow out of it. Zamenhof instead trained as an eye doctor and, in his spare hours, built a language.
He published it in Warsaw in 1887 as the Unua Libro — 'First Book' — under the pen name Doktoro Esperanto, 'the doctor who hopes'. The pseudonym stuck to the invention itself. Esperanto was engineered for learnability: sixteen foundational grammar rules with no exceptions, no irregular verbs, and every letter pronounced exactly one way. Nouns end in -o, adjectives in -a, plurals add -j, and the vocabulary draws mostly on Romance and Germanic roots, so that much of it looks half-familiar to any European reader. Words assemble like building blocks from unchanging roots and affixes: the prefix mal- reverses any meaning, so bona is good and malbona bad, granda large and malgranda small — one rule doing the work of whole dictionaries of opposites. Learners regularly report reaching conversational comfort in a fraction of the time that French or German demands.
Zamenhof had a cautionary tale in plain view. Volapük, invented by the German priest Johann Martin Schleyer around 1880, had boomed to hundreds of thousands of enthusiasts and then collapsed within a decade, wrecked by schisms and by its inventor's refusal to surrender control. Zamenhof did the opposite: at the first World Esperanto Congress at Boulogne-sur-Mer in 1905, attended by nearly seven hundred delegates from some twenty countries, he formally renounced personal authority over the language and handed it to its community. Esperanto weathered its own schism — the reformed offshoot Ido split away in 1907 and took a slice of the activists — but the mother tongue survived, complete with green-starred flag and an anthem, 'La Espero'.
A language the dictators feared
For a moment it nearly became official. In the early 1920s the League of Nations considered recommending Esperanto in schools worldwide; France, protective of French as the language of diplomacy, saw the proposal off. The dictators were blunter. Hitler denounced Esperanto in Mein Kampf, and its speakers were persecuted in Nazi Germany and the territories it conquered; Zamenhof himself had died in Warsaw in 1917, but all three of his children were murdered in the Holocaust. Stalin's purges, meanwhile, swept up Soviet Esperantists as suspected spies and cosmopolitans. A language built for peace kept ending up on the enemies lists of tyrants — perhaps the sincerest tribute it ever received.
How many people speak it today? The honest answer is that nobody knows. The commonly quoted ceiling is around two million with some competence; committed, fluent users number far fewer; and roughly a thousand people are native speakers — denaskuloj — raised in Esperanto by enthusiast parents, making it the only constructed language ever passed down in families at such scale. The most famous native speaker is the financier George Soros, whose father Tivadar wrote his memoirs in the language. The culture is small but real: UNESCO passed resolutions in Esperanto's favour in 1954 and 1985; the Pasporta Servo directory offers travelling Esperantists free lodging worldwide; and in 1966 a young William Shatner starred in Incubus, a horror film performed entirely in Esperanto. There is an original literature of novels and poetry, and the World Esperanto Association still runs its affairs from Rotterdam. Online courses have since introduced the language to hundreds of thousands more.
Why, then, did it plateau? Because a language's value lies almost entirely in who else speaks it. Esperanto had no state, no territory, no economy behind it — nothing anyone was obliged to read, sell in or study. English, carried by empire, Hollywood and the internet, took the global-auxiliary role Esperanto was designed for, complete with the built-in unfairness to non-natives that Zamenhof hoped to abolish. Later inventions — Klingon, Dothraki, Toki Pona — thrive as fandoms and puzzles rather than bridges between nations. Yet by any measure Esperanto remains the most successful constructed language in history, the only one with a living community stretching back unbroken to its founder. Two million speakers is a rounding error set against Babel; it is also, as the name insists, a hope that refuses to die.
Quiz nuggets
- L. L. Zamenhof, an eye doctor from Białystok, published Esperanto in 1887 under the pseudonym Doktoro Esperanto — 'the one who hopes'.
- Esperanto's grammar rests on sixteen foundational rules, with no irregular verbs; nouns end in -o and adjectives in -a.
- The first World Esperanto Congress met at Boulogne-sur-Mer in 1905; the rival offshoot Ido split away in 1907.
- Roughly a thousand people speak Esperanto natively, among them the financier George Soros.
- The 1966 horror film Incubus, starring William Shatner, was performed entirely in Esperanto.