After Gerhard I's death in 1290 his three younger sons partitioned Holstein-Itzehoe and Schaumburg into three branches, with Adolph VI the Elder, the third brother, getting Holstein-Pinneberg and Schaumburg south of the Elbe, the second brother Gerhard II the Blind getting Holstein-Plön, and the fourth Henry I receiving Holstein-Rendsburg.
In the 1370s, it became property of the Lords of Ptuj, and in 1438 it was inherited by the Counts of Schauenburg, the adversaries of the Counts of Celje.
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Ernst of Schaumburg (September 24, 1569 – January 17, 1622) was the first of the Counts of Schauenburg and Holstein-Pinneberg to earn the title of Prince, in 1619.