The main center of the area was Łęczyca, and among other oldest medieval towns were Brzeziny, Inowłódz, Orłów and Piątek.

During the German invasion of Poland, which started World War II in September 1939, German troops committed several massacres of Polish civilians in the region, including at Koźle, Łęczyca, Bądków, Kowalewice, Łagiewniki (present-day district of Łódź) and Sadówka (see Nazi crimes against the Polish nation).

[4][5] Afterwards, the region was occupied by Germany until 1945, and its Polish and Jewish population was subjected to various crimes, including deportation to forced labour, expulsions and mass murder.

[6] In Łódź, the Germans established the Łódź Ghetto, the second-largest ghetto for Jews in German-occupied Europe, the infamous Radogoszcz prison,[7] a racial research camp for expelled Poles, and a concentration camp for kidnapped Polish children of two to 16 years of age from various parts of occupied Poland.

[8] The Polish language of the inhabitants of the Łęczyca Land (along with that of the Sieradz Land) is considered the closest to the Polish literary language, as the region did not develop its own dialect, but was a place of blending of dialects from the neighboring larger regions of Greater Poland, Lesser Poland and Mazovia.