While Emperor Frederick Barbarossa in 1198 granted the ducal title to the Prince-Bishops of Würzburg in Eastern Franconia, Rhenish Franconia was divided and extinguished.
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The eastern half of the historic duchy of Franconia on the Main river around the city of Würzburg and Nuremberg forms the modern Franconian region of northern Bavaria, the Würzburg bishops retained the title of a "Duke of Franconia".
The castle in Rhenish Franconia was first mentioned in a 1081 deed of donation, when it was held by a local noble Diemar, a relative of Archbishop Siegfried I of Mainz.
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The dynasty probably hailed from the Rhenish Franconian Siegharding dynasty, which originally descended from the Kraichgau region and in the 10th century ruled in the Chiemgau of the German stem duchy of Bavaria.