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Holstein-Plön was a county (Grafschaft) in the Holy Roman Empire centred on Plön in Holstein. It was held by the House of Schauenburg who had ruled in Holstein and Stormarn since 1110/11. The county emerged before 1295 when the County of Holstein-Itzehoe was partitioned after the death of Count Gerhard I of Holstein-Itzehoe (died 1290) into the counties of Holstein-Plön, Holstein-Pinneberg and Holstein-Rendsburg.
The following counts ruled over Holstein-Plön: