Sierniki is a village in the administrative district of Gmina Rogoà ºno, within Oborniki County, Greater Poland Voivodeship, in west-central Poland.
According to tradition, Sierniki was the place of the death of King Przemysà  II in 1296. Having been severely wounded in the course of his kidnap in Rogoà ºno, it is said that the king was unable to travel further, and was killed in this place by his captors.
Sierniki was a private village of Polish nobility, administratively located in the Gniezno County in the Kalisz Voivodeship in the Greater Poland Province of the Polish Crown. The old Radolià Âski Palace is located in the village. It was erected by noblewoman Katarzyna Radolià Âska.