Overview
The Duchy of Oldenburg was a historical duchy located in what is now north-western Germany, centered on the town of Oldenburg, its capital. Founded in 1774, it was established when the county of Oldenburg, inherited by King Frederick III of Denmark in 1667, was transferred to Frederick August I of the Holstein-Gottorp branch in 1773 and subsequently elevated to a duchy. After a period of annexation by the French Empire in 1810, the duchy was restored in 1815 as a grand duchy, with Duke Peter I assuming the title of Grand Duke in 1823. The Duchy of Oldenburg was dissolved in 1918.
Historical Periods
Duchy of Oldenburg (1806–1806)
1806 CE – 1806 CE
Capital: OldenburgArea: 4,393 km²
Duchy of Oldenburg (1807–1810)
1807 CE – 1810 CE
Capital: OldenburgArea: 4,436 km²
Duchy of Oldenburg (1814–1819)
1814 CE – 1819 CE
Capital: OldenburgArea: 4,436 km²
Duchy of Oldenburg (1820–1833)
1820 CE – 1833 CE
Capital: OldenburgArea: 4,828 km²
Duchy of Oldenburg (1834–1839)
1834 CE – 1839 CE
Capital: OldenburgArea: 4,851 km²
Duchy of Oldenburg (1840–1869)
1840 CE – 1869 CE
Capital: OldenburgArea: 4,807 km²
Duchy of Oldenburg (1870–1870)
1870 CE – 1870 CE
Capital: OldenburgArea: 4,807 km²