"Old East Slavic (also referred to as Rusian (sic, with one \u2018s\u2019, from Rus\u2019) and Old Russian, but not to be confused with the child dialects of the later post-Kievan Rus', Old Russian and Old Ruthenian) was a language used in the 10th\u201315th centuries by East Slavs in Kievan Rus' and states which evolved after the collapse of Kievan Rus'."@en . . . "rus\u012Dsk\u016D j\u0119zyk\u016D"@en . . . "Old East Slavic"@en . "orv" .