German name of Kruszwica, town in central Poland, Kuyavian-Pomeranian Voivodeship
After grandfather's death in 1370, young Casimir initially became his partial successor, as the last will gave him lands of Dobrzyń, Bydgoszcz, Kruszwica, Złotów and Wałcz as fiefs.
In April 2008, five thousand people demonstrated in Kruszwica to protect cultural heritage and the nature reserve at Lake Gopło, against the Tomisławice opencast mine, which was due to open in 2009.