Nassau Castle, located in Nassau, Rhineland-Palatinate, Germany, was the original seat of the House of Nassau. The ruins of the castle are situated on a rock outcropping about 120 m above the Lahn River. The House of Nassau was an aristocratic dynasty among whose descendants are the present-day monarchy of the Netherlands and Luxembourg.
The castle was founded around 1100 by Count Dudo-Henry of Laurenburg , the founder of the House of Nassau. In 1120, Dudo-Henry's sons and successors, Counts Robert I and Arnold I of Laurenburg, established themselves at Nassau Castle with its tower. They renovated and extended the castle complex in 1124.
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