the invented language that had the most speakers is Esperanto. this language was created in 1887 by Lazarus Ludwig Zamenhof , a Russian doctor. Zamenhof lived in an area populated by four different ethnic groups that spoke four different language : Russian , Polish , German , and Yiddish. There were a great deal of problems between these groups. Zamanhof felt that the language difference between the groups was the root of the problem. this gave him the idea of creating a language that would not belong to any one country or culture , but instead , would belong equally to all people. The hope was that a neutral second language would break down language barriers and build a sense of equality and brotherhood between nations. The language which he created to fulfill this dream was called Esperanto , which mean hope in the Esperanto language.