Rogo no [r n ] (German: Rogasen) is a town in Poland, in Greater Poland Voivodeship, about 40 km north of Pozna . Its population is 11,337 (2010). It is the seat of the administrative district (gmina) called Gmina Rogo no.King Przemys II of Poland was murdered in or near Rogo no in 1296. According to one tradition he was kidnapped while staying at the town, but was so badly wounded in the process that he was unable to continue the journey, and was killed by his captors at Sierniki a few miles to the east. Sierniki [ er niki] is a village in the administrative district of Gmina Rogo no, within Oborniki County, Greater Poland Voivodeship, in west-central Poland.