Who was Ludwik Lejzer Zamenhof? Hm. There is a monument for him in the city park, close to the Stanislav spring.
Zamenhof, born 1859 in Bialystok (now Poland, at that time Russia), was an ophthalmologist who created the artificial language Esperanto. Under pseudonym Doktor Esperanto he published the basics of the new language in a document in 1887. He studied medicine in Moscow and Warszaw and worked successfully as an eye specialist in Vienna. He died in 1917 in Warszaw.