ENThe review of the book of German historian Matias Niendorf (Das Großfürstentum Litauen: Studien zur Nationsbildung in der Frühen Neuzeit (1569–1795). Wiesbaden: Harrassowitz, 2006). The monograph is devoted to the problems of ethnogenesis and nation building of Lithuanian nation during the period of the Grand Duchy of Lithuania. Key words: Grand Duchy of Lithuania, History of Lithuania, ethnogenesis, the building of nations. [From the publication]