Merkel is of German and Polish descent. Her paternal grandfather, Ludwik Kasner, was a German policeman of Polish ethnicity, who had taken part in Poland's struggle for independence in the early 20th century. He married Merkel's grandmother Margarethe, a German from Berlin, and relocated to her hometown where he worked in the police. In 1930, they Germanized the Polish name Kaźmierczak to Kasner. Merkel's maternal grandparents were the Danzig politician Willi Jentzsch, and Gertrud Alma née Drange, a daughter of the city clerk of Elbing (now Elbląg, Poland) Emil Drange. Since the mid 1990s, Merkel has publicly mentioned her Polish heritage on several occasions and described herself as a quarter Polish, but her Polish roots became better known as a result of a 2013 biography.