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Castell-Rüdenhausen was a county of the Holy Roman Empire in the region of Franconia in northern Bavaria. It was created in 1597 as a partition of Castell and was ruled by a branch of the Counts of Castell. In 1806, it was mediatised to Bavaria.
On 7 March 1901, both branches of the family were raised to the hereditary rank of prince in primogeniture with the style of Serene Highness by Luitpold, Prince Regent of Bavaria. A morganatic branch of this princely house is the comital Faber-Castell family.
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