In 1316, the town of Słupsk (developed from a few medieval settlements located on the banks of the Słupia River, which existed since the 8th and 9th centuries), was taken over by the Pomeranian dukes from the House of Griffins, which owned it, with a brief pause, until the end of the dynasty, in 1637. More then that, in 1368 the Duchy of Słupsk was separated from Pomerania-Wolgast, and the town of Słupsk become its capital and the seat of dukes until 1478, when Pomerania was reunited again, under Bogislaw X.
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