Wieluń is a town in south-central Poland with 21,624 inhabitants. The town is the seat of the Gmina Wieluń and Wieluń County, and is located within the Łódź Voivodeship. Wieluń is a capital of the historical Wieluń Land. Wieluń has a long and rich history. In the past, it used to be an important urban trade centre of the Kingdom of Poland. Several Polish kings and notables visited the town, but following the catastrophic Swedish Deluge, Wieluń declined and never regained its status.