The longest-established religious faith in Italy is Judaism, Jews having been present in Ancient Rome before the birth of Christ. Italy has seen many influential Italian-Jews, such as Luigi Luzzatti, who took office in 1910, Ernesto Nathan served as mayor of Rome from 1907 to 1913 and Shabbethai Donnolo (died 982). During the Holocaust, Italy took in many Jewish refugees from Nazi Germany. However, with the creation of the Nazi-backed puppet Italian Social Republic, about 15% of 48,000 Italian Jews were killed. This, together with the emigration that preceded and followed the Second World War, has left only a small community of around 45,000 Jews in Italy today.