Ruthenia

from The American Heritage® Dictionary of the English Language, 5th Edition.

• A region of western Ukraine south of the Carpathian Mountains. Ruled for centuries by various powers, including Poland and Austria-Hungary, it was later a province of Czechoslovakia (1918–1939) and was annexed by the USSR in 1945.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun The territory of Eastern Europe inhabited by Rusyns, on the slopes of the Carpathian Mountains in parts of Ukraine, Poland and Slovakia.
• proper noun historical Lands inhabited by Ukrainians (Ruthenians) of the former Austrian Empire kingdom of Galicia (1772–1918), corresponding to parts of Western Ukraine.
• proper noun historical Western East-Slavic lands, including the principalities of Halych-Volynia and Kiev, which united with Lithuania and Poland (14th c–1772), corresponding to parts of Belarus and Ukraine.
• proper noun historical Rus, an East Slavic medieval state (880–12th c), corresponding to parts of Belarus, Russia, and Ukraine.
• proper noun Russia (Latin)