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 Holstein-Itzehoe, Holstein-Kiel, Holstein-Pinneberg (till 1640), Holstein-Plön, Holstein-Segeberg and Holstein-Rendsburg (till 1460) and through the latter at times also the Duchy of Schleswig.