1015 First documentary mention of Plesse Castle as the property of Bishop Meinwerk of Paderborn, who bequeathed Plesse to his church. Around 1150, the Lords of Höckelheim moved their residence to Plesse Castle and henceforth called themselves "von Plesse". For more than 400 years the castle has been their residence, administrative and ruling center. 1192 - Emperor Henry VI exchanges Desenberg Castle with the Paderborn Church for Plesse Castle, in 1195 this exchange is reversed. 13./14. Century. The Plesse dominion resists the expansion of the Duchy of Brunswick and later forms an independent territory within the Duchy. The supply of about 50 people is done by a domain at the foot of the castle hill. 1571 - The family of the noble lords of Plesse dies out and the castle falls to the landgraves of Hesse according to the inheritance contract. 1624 - During the Thirty Years' War, having fled Kassel, Landgrave Moritz of Hesse resides at Plesse Castle. During that time, the castle offered protection to the inhabitants of the surrounding villages. In 1627 it was besieged by imperial troops. Around 1660, the inhabitants leave the castle after the official seat was transferred to the district of Bovenden. Since then, the castle has been deteriorating. The walls fall into oblivion, legends and ghost stories revive the imagination around the ruin