The sub-duchy of Schleswig-Holstein-Sonderburg-Norburg emerged as a collateral line of the House Schleswig-Holstein-Sonderburg. The region of Nordborg (also: Norburg or Nordburg) is on the island of Als.
The sub-duchy of Schleswig-Holstein-Sonderburg-Norburg emerged as a collateral line of the House Schleswig-Holstein-Sonderburg. The region of Nordborg (also: Norburg or Nordburg) is on the island of Als.