LTReikšminiai žodžiai: Lietuvos Didžioji Kunigaikštystė (LDK; Grand Duchy of Lithuania; GDL); Lietuvos Metrika; Raštija; Lithuanian Metrica; Writing.
ENIn the Grand Duchy of Lithuania coexisted various languages. The System of a Linguistic equilibrium has arisen during centuries. The authorities supported a Language pluralism. Long time the Lithuanian language had a worthy Place in this System. The author considers that the State language in the Grand Duchy of Lithuania was absent. The author designates a searches of the State language of the Grand Duchy of Lithuania as a anachronistic method of a research. [From the publication]