Kasteln Castle is a castle in the municipality of Oberflachs in Canton Aargau, Switzerland. It is located west of the village on a rocky outcrop, surrounded by vineyards and woods. Today, it serves as a boarding school for students with behavioral problems. The immediately adjacent castle Ruchenstein was demolished in 1643, when the small fort was rebuilt into a Schloss Kasteln.
About 1200 the original fortress Kasteln was built in the middle Schenkenberger valley, a few kilometers away from Schenkenberg Castle. In 1238 the castle is first mentioned in a deed of gift to the residents of the castle who were vassals of the Kyburgs. In 1262 Ruchenstein castle was built on the cliff directly behind the fort for the Knight of Ruchenstein. After the extinction of the Kyburg line in 1264, the castle came under the power of the House of Habsburg. Then in 1301 the Ruchenstein line died out, ten years after they had been given the fort as a gift by the Habsburgs. Both castles were acquired by the lords of Mülinen from Brugg. From here, they ruled over a small area on the southern edge of the Jura.
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