A number of conquest attempts were launched against Prussia by Poland ref External link William Pierson book also  Chronicon Polonor Ongoing military attacks in order to subjugate Prussia Labuda disputes this   Marija Gimbutas in her book The Balts  describes the Prussian and Baltic territory reaching much further west south southwest southeast than the later Prussia when Poland came into existense and conquered much additional territory claimed by Polish to have been a uniting of Polish tribes however for centuries rejected and fought against by the ones involved  Prussians are also recorded as Ulmerugi Holmrugi Island Rugians in the Vistula river area That name still showed up on maps of area around Culm Culmerland Kulmerland territory which was surrounded by the Vistula river    Boleslaw I claimed to have conquered part of the Prussians and even his headstone is supposed to have shown something like this He also claimed to have put columns pillars up in the newly conquered Prussian territory to mark the new border of territory which he now claimed as his which was not his  So Szopen Culmerland was not Polish land it was Prussian land partially conquered temporarily by Poland   Gethen Getae is yet another name for the Prussians that name was still known to Polish historians as well  Szopens mentioning of Bruno of Querfurt as having taken part in Boleslaw I battles against Prussians  also makes no sense because Bruno was dead since