Duchy of Oldenburgball

Duchy of Oldenburgball was a state in Northern Germanyball.

History
Duchy of Oldenburgball was estabilished as a county in 1091 during the Breakup of Saxonyball and in 1774 raised as a Duchy. In 1810 was conquered by Napoleonic Franceball. In 1815 he became indipendent as a Grand Duchy.