Short answers, pulled from the story.
Johann Boemus published a Latin treatise titled Mores, leges et ritus omnium gentium in 1520. The chapter De Rusia sive Ruthenia described a vast territory stretching from the Baltic Sea to the Caspian Sea.
The state adopted the combined title Grand Duchy of Lithuania and Ruthenia after western principalities joined following the Mongol invasion in the thirteenth century. These titles merged when the Polish, Lithuanian Commonwealth formed on the 3rd of July 1569.
Karl Ernst Claus isolated the element ruthenium from platinum ore found in the Ural Mountains in 1844. He named this chemical element after Ruthenia to honor Russia.
In May 1919, Carpathian Ruthenia gained nominal autonomy within Czechoslovakia as Subcarpathian Rus'. Three political orientations emerged among the Ruthenian people during this period including Russophiles, Ukrainophiles, and Ruthenophiles.
The Soviet government considered Rusyns to be Ukrainian rather than an official ethnic group. In 1945, the territory was annexed to the Ukrainian SSR following military occupation.