For many decades, even researchers of the life and work of V.I. Ulyanov (Lenin) knew almost nothing about his origin. And those who knew did not have the opportunity to tell the truth. The Soviet government published a version of Lenin's Russian origin, thereby completely erasing his entire family genealogy. In the book by M.G. Stein considers the true pedigree of V.I. Lenin, the history of his paternal and maternal ancestors and his closest relatives, including the German families of the Curtiuses, Weizsäckers and others. The author uses in his book documents and materials from numerous Russian archives and the work of German and Swedish researchers.