In 1075, Kruto lured Budivoj of the Nakonids into the ""castrum plunense"" (according to Helmold of Bosau), laid siege to him, and then once Budivoj's men had given themselves up after Kruto's promises to let them withdraw freely, Kruto had them slain. In 1139 the Count of Holstein, Adolf II of Schauenburg, destroyed the fortress, ending the domination of the Slavs in the region of Plön. Twenty years later, Adolf II had the castle on the island rebuilt, but soon had it moved to the present hill of "Schlossberg" ("castle hill"). It was here, under the protection of the castle and close to the major trading route from Lübeck to the north, that a Saxon market town emerged.