The castle was first mentioned in a document in 1266. The Knights of Blarnhurst once lived there, and then the von Düngelen family at the beginning of the 14th century. In 1338, Rötger von Düngelen made his possessions available to the Count of Kleve as an Offenburg for use in the event of war. Through marriage, the castle passed to Philipp von Viermundt († 1528) in 1496, and to the Barons of Romberg from 1624 to 1891, who had inherited it. After that, by inheritance until 1924, the Freiherren Weichs zur Wenne and then the Klöckner-Werke were responsible for the fortunes of the castle.
The plant originally consisted of four wings. The gatehouse, designed as a fortification, is the oldest part of the complex, the chapel dates back to 1332 (demolished in 1941). The castle in the style of the late Renaissance dates from the years of reconstruction from 1530 to 1584 and is inhabited. Since the castle is privately owned, there are no guided tours or visits.
On February 16, 2006, Savings Bank Vest became the owner of the castle. After four years of foreclosure, she bought it at auction. A part of the north wing has consisted of owner-occupied apartments since 2001, the remaining part of the palace became the property of Bodo Möhrke from Dortmund in January 2007.
In 2010 the last part of the Gräftenhaus was ready to move into. A year later, the old gatehouse could be used as an apartment again. The palace grounds are part of the Bladenhorst Landscape Park and laid out in the style of an English landscape garden.
Readings, concerts, lectures, dinner events, wine and summer festivals take place at irregular intervals in the Knights' Hall or in the courtyard of the castle. The castle regularly opens to visitors on the annual Open Monument Day in September. Vintage cars are also often guests on various tours. Since 2015, civil weddings of the city of Castrop-Rauxel have taken place in the Knights' Hall.