Schaumburg Partition of 1640
After the childless death in 1640 of Count Otto V, the rule of the House of Schaumburg ended in Holstein. The County of Holstein-Pinneberg was merged under Christian IV with his royal share in the Duchy of Holstein, which is now part of the state of Schleswig-Holstein. For Christian IV and his successors see List of rulers of Schleswig-Holstein#House of Oldenburg (1640–1713)
The Principality of Schaumburg proper, however, was partitioned among the agnatic Schauenburg heirs into three parts, one incorporated into the ducal Brunswick and Lunenburgian Principality of Lüneburg, the second becoming the County of Schaumburg-Lippe and the third continuing the name County of Schaumburg, ruled in personal union by Hesse-Cassel. All the three are now part of the state of Lower Saxony. The Sovereign Lordship of Gemen, in 1531 acquired for Schaumburg through marriage by Jobst I, and ruled by his second-born son of Jobst II (ca. 1520–1581, regnant since 1531), passed on to the family of Limburg Stirum. Gemen is in today's North Rhine-Westphalia.
Read more about this topic: Counts Of Schauenburg And Holstein