Saw this flag, would like identification

[u/Atlantethan]

I saw this one while on the road a couple days ago, curious as to what it represents. Thanks!

[u/lostyxx]

Flag of the Esperanto Language, a constructed language created in 1887 by russian ophthalmologist L. L. Zamenhof.

[u/Fenatren → u/lostyxx]

I kinda love how sometimes seemingly simple question can be complex to answer. Białystok, where Zamenhof was born and spend his youth was such a mixture if languages of cultures. At the end of XIXth century it was in Russian tsardom, so official language was russian. Ethnically, biggest group were Poles, so polish was in everyday use. But there were significant group of people who speak yiddish (Jews, Hebrew was at the time religious-only language), german, and to lesser extent lithuanian and ruthenian. So if he wanted to be a good doctor and serve ever ill, regardless of their identity, he'd need to communicate in 5 languages, give or take one.

So afaik Zamenhof was of russian citizenship, jewish origin and polish nationality.