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In page Sayn-Wittgenstein-Berleburg:

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Sayn-Wittgenstein-Berleburg was a partition of Sayn-Wittgenstein in the 16th century; the southern and more-developed portion was the County of Sayn-Wittgenstein-Wittgenstein with its seat Laaspe (now Bad Laasphe) and its residence Wittgenstein Castle, whereas Berleburg is tucked away in a very rural landscape in the midst of vast forests. Sayn-Wittgenstein-Berleburg was raised from a county with Imperial immediacy to an immediate principality (Reichsfürstentum) in 1792, and was mediatised to the Grand Duchy of Hesse in 1806 before being annexed to Prussia in 1816.