Walery Jaworski
Walery Jaworski (March 20, 1849 – July 17, 1924), was one of the pioneers of gastroenterology in Poland.
In 1899 he described bacteria living in the human stomach that he named "Vibrio rugula". He speculated that they were responsible for stomach ulcers, gastric cancer and achylia. It was one of the first observations of Helicobacter pylori. He published those findings in 1899 in a book titled "Podręcznik chorób żołądka" ("Handbook of Gastric Diseases") but it was available only in Polish and went unnoticed.