Castell was a county of northern Bavaria, Germany, ruling a string of territories in the historical region of Franconia, both east and west of Würzburg.
They were a member of the Fränkische Grafenkolleg ("Franconian Counts College").
The two main branches of the House of Castell were Protestant Castell-Remlingen (later split into Castell-Castell) and Protestant and Catholic Castell-Rüdenhausen.
Castell was composed of three territories (Flecken) and 28 villages, with about 10,000 inhabitants at the time of mediatisation.
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