ENThe concept of «insulting the majesty of the sovereign» in the Statutes of the Grand Duchy of Lithuania of 1529, 1566 and 1588 in the context of the struggle between the Grand Duchy of Lithuania and the Russian State for the possession of territories that were previously belonged to Ancient Russia is analyzed in this article; it includes the conclution about a new type of crime for Lithuanian legislation – «insulting the majesty of the sovereign» or «escape to «enemy land» and analyzes the correlation between the adoption of the legal norm of «insulting the majesty of the sovereign» and how Lithuanian appanage princes had changed their citizenship and be came the Grand Duke of Moscow’s subjects; it examines how Russian State became legally assigned the status of «enemy state» in the Lithuanian Statutes; it concludes that the adoption of these legal norms was conjunctural as a result of the Russian-Lithuanian wars of the XV–XVI centuries; it also examines the sanctions for «insulting the majesty of the sovereign». Keywords: treason, insults to the majesty of the sovereign, escape, execution.