Ruthenia

thumb|Rus' land/Ruthenia in yellow, Kievan Rus' under Oleg the Wise in gray, 862–912 thumb|The area of Red Ruthenia against the background of the administrative division of the [[Second Polish Republic in 1939, prior to the outbreak of World War II.]] Ruthenia is an exonym, originally used in Medieval Latin, as one of several terms for Rus'. The ethnonym Ruthenians was used to refer to the East Slavic and Eastern Orthodox people of the Grand Duchy of Lithuania and the Kingdom of Poland, and later the Polish–Lithuanian Commonwealth and Austria-Hungary, mainly to Ukrainians and sometimes Belarus