Castell-Rüdenhausen was a County in the region of Franconia in northern Bavaria of the Holy Roman Empire, ruled by a branch of the Counts of Castell.
It was created as a partition of Castell and 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.
[1] A morganatic branch of this Princely House is the famous noble Faber-Castell family.
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