Arenenberg is an estate with a small chateau, Schloss Arenenberg, in the municipality of Salenstein at the shore of Lake Constance in Thurgau, Switzerland that is famous as the final domicile of Hortense de Beauharnais. Today it houses the Napoleonmuseum. It is a Swiss heritage site of national significance.
Arenenberg was built in the early 16th century by the mayor of Constance Sebastian Geissberg. The name of the farm that had been located there before was Narrenberg , perhaps not a suitable name to hold on to, but also the hill towards the lake was named "Arnhalde". By the 19th century the current name was used.
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