The first ghetto of World War II was established on 8 October 1939 at Piotrków Trybunalski (38 days after the invasion),[6] with the Tuliszków ghetto established in December 1939. The first large metropolitan ghetto known as the Łódź Ghetto (Litzmannstadt) followed them in April 1940, and the Warsaw Ghetto in October. Most Jewish ghettos were established in 1940 and 1941.