Schloss Wildenberg, Medieval château in Olsberg, Germany

Schloss Wildenberg is a medieval fortified structure positioned on elevated ground with an irregular ring formation. The site contains remnants of defensive walls and a square tower featuring a rounded archway entrance.

Around 953 a chapel is said to have been built here under Brun von Köln; after the founding of Grafschaft Monastery, chapel and farm belonged to it. The present castle dates to 1295, when Widukind von Grafschaft built the residential tower and rebuilt the chapel in Romanesque style. His widow Adelheid von Wildenberg gave the complex its name. In 1817 the historian Johann Suibert Seibertz became owner and had remains of the old tower and house demolished in 1822.

The name comes from Adelheid von Wildenberg, widow of the tower's builder Widukind von Grafschaft, who lived here after his death. The site began as a chapel and estate of Grafschaft Monastery, and the noble lords of Grafschaft resided here as the monastery's bailiffs.

This private residence is not open to public entry, though exterior views of the castle walls and towers are available from nearby walking paths. The surrounding area allows for observation of the fortification from a distance.

The name Wildenberg comes not from the builders but from Adelheid von Wildenberg, the widow of Widukind von Grafschaft, who lived at the castle after his death. The residential tower is attributed to Widukind around 1295, when the chapel was also rebuilt in Romanesque style.