Duchy of Anhalt
In 1603 the principality of Anhalt-Köthen was created, when the principality of Anhalt was split in five parts. In 1665 it merged with Anhalt-Plötzkau, and in 1807 it became a duchy. 1847 it was divided between Anhalt-Dessau and Anhalt-Bernburg, and in 1853 it was merged with Anhalt-Dessau to form the Duchy of Anhalt-Dessau-Köthen.