The history of the Jews in Cologne is conjectured to date back possibly as far as the late Roman Empire, and is officially documented from the period of the High Middle Ages. Over its history, the Jewish community of Cologne has suffered persecutions, many expulsions, massacres and destruction. The community numbered about 19,500 people before its dispersal, murders and destruction in the 1930s by the Nazis before and during World War II. The community has re-established itself and now numbers about 4,500 members. Because of its historical continuity, today's Jewish synagogue calls itself the "oldest Jewish congregation north of the Alps".