Książ Wielkopolski (Polish pronunciation: [ˈkɕɔ̃ʐ vjɛlkɔˈpɔlskʲi]; German: Xions, 1940–43 Tiefenbach, 1943–45 Schonz) is a town in Śrem County, Poland,[2] with 2,738 inhabitants (2010).

[3] Following the joint German-Soviet invasion of Poland, which started World War II in September 1939, the town was occupied by Germany until 1945 and local Poles were subjected to various crimes.

On October 20, 1939, the German Einsatzgruppe VI carried out a public execution of 17 Poles at the main square as part of the Intelligenzaktion.

[4] Among the victims were a bank director, teacher, merchant, forester, military officer, landowners and mayor of the nearby town of Dolsk.

[6] Under German occupation the town's name was changed to Tiefenbach and then Schonz in attempt to erase traces of Polish origin.