Holstein-Plön was the name of a county ruled by the

House of Schauenburg The House of Schaumburg was a dynasty of German rulers. Until c. 1485, it was also known as the House of Schauenburg. Together with its ancestral possession, the County of Schaumburg, the family also ruled the County of Holstein and its partitions ...

that ruled in

Holstein Holstein (; nds, label=Northern Low Saxon, Holsteen; da, Holsten; Latin and historical en, Holsatia, italic=yes) is the region between the rivers Elbe and Eider. It is the southern half of Schleswig-Holstein, the northernmost state of German ...

and Stormarn from 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 The County of Holstein-Pinneberg (), also known as the County of Schauenburg and Holstein-Pinneberg (), was a small territory which existed from 1290 until 1640, centred around Pinneberg in modern-day Schleswig-Holstein, Germany. Rise and fall of ...

and

Holstein-Rendsburg Holstein-Rendsburg is the name of a county that existed from 1290 to 1459, ruled by a line of the Schauenburg family. Rise and fall of the county The Schauenburgs had ruled in Holstein since 1110/1111. In 1290, when Count Gerhard I of Holstei ...

. The following counts ruled over Holstein-Plön: * 1295 – 1312 Gerhard II ''the Blind'' (born 1253; died 1312), married Agnes of Brandenburg (born after 1255; died 1304), daughter of John I of Brandenburg, in 1293 * 1312 – 1314 Gerhard IV (died before 1320), dean (''Dompropst'') of Lübeck Cathedral, 1300–1311 * 1312 – 1359 John III ''the Mild'' (born ca. 1296; died 1359) * 1323 – 1350 Gerhard V (born ca. 1315; died 1350) was never a ruler, but only a landowner and canon at Lübeck Cathedral * 1321 – 1359 John III ''the Mild'', also Count of Holstein-Kiel and Lord of Fehmarn * 1359 – 1390 Adolphus VII (died 1390), also Count of Holstein-Kiel and Lord of Fehmarn Following the death of Gerhard II his sons, Gerhard IV of Holstein-Plön 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. John III conquered Holstein-Kiel with

Gerhard III of Holstein-Rendsburg Gerhard III of Holstein-Rendsburg ( – 1 April 1340), sometimes called Gerhard the Great, and in Denmark also known as ''Count Gert'' or ''den kullede greve'' ("the bald count"), was a German prince from the Schauenburg family who ruled Hol ...

. Holstein-Plön reverted to Holstein-Kiel in 1350 upon the death of 27-year-old Gerhard V without issue. When the Plön line died out in 1390, Holstein-Kiel (and Holstein-Plön within it) reverted to

, ruled by Count Nicholas of Holstein-Rendsburg (died 1397) and his nephew, Count Gerhard VI of Holstein-Rendsburg (died 1404). A circa-1400 map of the region shows the borders of Holstein-Rendsburg and its subordinate counties, Holstein-Kiel and Holstein-Plön.

Rise and fall of the county

{{DEFAULTSORT:HolsteinPlon Plon Counties of the Holy Roman Empire Holstein Former monarchies of Europe