Holstein Partition of 1290 and Reversions of 1350 and 1390
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. The eldest brother John was Canon at the Hamburg Cathedral.
After the death of Gerhard II his sons Gerhard IV and his younger half-brother John III the Mild inherited and ruled in Holstein-Plön together. In 1316 the brothers militarily seized the possessions of John II the One-Eyed (d. 1321) in Holstein-Kiel, whose sons had been killed. John III the Mild, before a second-born co-ruling count in Plön, then received Kiel from the deposed John II the One-Eyed, a cousin of his father Gerhard II the Blind. Gerhard IV continued ruling Holstein-Plön as sole count.
After the death of John III's nephew Gerhard V, Count of Holstein-Plön in 1350, who had succeeded Gerhard IV, the Plön line became extinct and John III re-inherited their possessions. In 1390 his son Adolphus IX (aka VII) ruling since 1359 Kiel including Plön, died without issue and thus Nicholas (Claus) of Holstein-Rendsburg and his nephews Albert II and Gerhard VI (jointly ruling till 1397) succeeded to the territories of Holstein-Kiel and Holstein-Plön.
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