Holstein-Plön

Holstein-Plön was a line of the House of Schauenburg that ruled in Holstein and Stormarn from 1110/11. It emerged before 1295 when the County of Holstein-Itzehoe was divided up 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:

After the death of Gerhard II, Gerhard IV and his younger half-brother John III ruled jointly over Holstein-Plön. In 1314 Gerhard IV sold his lands to John III, who thus became the sole Count of Holstein-Plön. He conquered Holstein-Kiel with Gerhard III. When the Plön line died out in 1390, Holstein-Plön and Holstein-Kiel went to Count Nicholas of Holstein-Rendsburg (died 1397) and his nephew, Count Gerhard VI of Holstein-Rendsburg (died 1404).

Rise and fall of the county

 
 
 
 
Holstein
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Holstein-Kiel
(1261–1390)
 
 
 
 
 
Holstein-Itzehoe
(1261–1300)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Holstein-Segeberg
(1273-1308)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Holstein-Plön
(1300–1390)
 
Holstein-Rendsburg
(1300–1459)
 
Holstein-Pinneberg
(1300–1640)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Duchy of
Holstein
(from 1474)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Imperial County of Rantzau
(1650–1726)