The County of Ravensberg was a historical county of the Holy Roman Empire. Its territory was in present-day eastern Westphalia, Germany at the foot of the Osning or Teutoburg Forest.
Ravensberg was first mentioned in the 12th century; its first capital was Burg Ravensberg. The Counts of Ravensberg then had Sparrenberg Castle built in Bielefeld ca. 1240–50, which they made their seat.
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