De vastacione parcium inferiorum terre Prussie.

Swantepolcus's Apostasy and the Prussian Revolt

Swantepolcus, casting aside the fear of God, incites the Prussian neophytes to rebel, leading a devastating invasion of the lower lands that massacres Christians, destroys forts, and plunges the region into ruin.

With these things accomplished, Swantepolcus cast aside the fear of God, adding evils worse than the former ones, and brought the sin of persecution—which before had been almost hidden—into the open. For he decreed that the new converts—who would easily slip back into their former errors—should, on a single day, from all the territories of the land of Prussia, having spurned and cast off the practice of the faith, rebel against the brothers by waging war. So all the Prussians were gathered as one, and Swantepolcus was made their leader and commander; with armed hand and outstretched arm they entered the lower parts of that land, and pitilessly killed all the long-established Christians who had come from Germany in support of Prussia, leading away the women and children into perpetual captivity. They also killed Brother Conrad of Tremonia, a devout man and experienced in military matters, along with his entire household, and storming all the forts except Balgam and Eibingum, having killed the brothers and the Christian faithful, they utterly destroyed them.