Schleswig-Holstein-Sonderburg-Norburg

When he died in 1622, the land was divided amongst his sons; like their father they were so-called Abgeteilte Herren whose status was not related to their dominion.

Thus the northern part of Alsen initially went to John Adolf, whereupon he became the first Duke of Schleswig-Holstein-Sonderburg-Norburg.

In 1679 the Norburg estate went to the line of Schleswig-Holstein-Sonderburg-Plön and was given as an inheritance to Augustus of Schleswig-Holstein-Plön-Norburg, the second son of the Duke of Plön, Joachim Ernest.

After the death of Duke Joachim Frederick, Frederick Charles, the son of his deceased brother, Christian Charles, - who came from a morganatic marriage - was named in 1722 as the new Duke of Plön and Norburg.

Formally the last Duke of Norburg, he then abandoned the estate in favour of the Danish king, who took over all his debts in return.