> During its existence, Kievan Rus' was known as rusĭskaja zemlja, translated as the "land of Rus'",[21] or the "Rus' land" (Old East Slavic: роу́сьскаꙗ землꙗ́), with Rus' being derived from the ethnonym Роусь, Rusĭ (Medieval Greek: Ῥῶς, romanized: Rhos; Arabic: الروس, romanized: ar-Rūs), in Greek as Ῥωσία, Rhosia, in Old French as Russie, Rossie, in Latin as Rusia or Russia (with local German spelling variants Ruscia and Ruzzia), and from the 12th century also as Ruthenia or Rutenia.[22][23]
> During its existence, Kievan Rus' was known as rusĭskaja zemlja, translated as the "land of Rus'",[21] or the "Rus' land" (Old East Slavic: роу́сьскаꙗ землꙗ́), with Rus' being derived from the ethnonym Роусь, Rusĭ (Medieval Greek: Ῥῶς, romanized: Rhos; Arabic: الروس, romanized: ar-Rūs), in Greek as Ῥωσία, Rhosia, in Old French as Russie, Rossie, in Latin as Rusia or Russia (with local German spelling variants Ruscia and Ruzzia), and from the 12th century also as Ruthenia or Rutenia.[22][23]
https://en.wikipedia.org/wiki/Kievan_Rus%27