Oldenburg and Delmenhorst

Oldenburg was originally a county within the tribal duchy of Saxony. The fall of duke Heinrich the Lion 1180 meant that the counts of Oldenburg thereafter was only subordinated to the emperor. But before then had the county of Wildeshausen been detached from Oldenburg through inheritance 1143. Additional partitions of Oldenburg occurred 1278, 1440 and 1577, each time was it partitioned in Oldenburg and Delmenhorst but because the lines that ruled Delmenhorst became extinct was that part repeatedly reunited with Oldenburg. Christian VI became king of Denmark and Norway 1448 and ceded his share of Oldenburg to his brother Gerhard 1454. Christian's line of the house of Oldenburg inherited Oldenburg again in 1667 but exchanged it 1773 with the duchy of Holstein-Gottorp. The new count Friedrich August became elevated to duke 1777 and from 1815 was Oldenburg a grand duchy.

County of Oldenburg

House of Oldenburg

1101-1108 1108-1143 1143-1168 1168-1211 1211-1251 1211-1262 1251-1272 1272-1278 1278-1305 1305-1345 1345-1368 1368-1386 1386-1398 1386-1420 1398-1423 1423-1440 1440-1454 1440-1483 1483-1498 1483-1526 1488-1492 1526-1529 1526-1529 1526-1529 1529-1573 1573-1577 1573-1603 1603-1667	Egilmar I Egilmar II Christian I der Streitbare (the Warlike) Moritz Christian II Otto II Johann IX (III) Christian III Johann X (IV) Johann XI (V) Konrad I Konrad II Christian IV Moritz III Christian V Dietrich der Glückselige (the Fortunate)
	Christian VI
	Gerhard der Streitbare (the Warlike) Adolf Johann XIV Christian VII Johann XV Georg Christof Anton I Anton II (Delmenhorst 1577-1619)
	Johann XVI
	Anton Günther
Danish Line
1667-1670 1670-1699 1699-1730	Friedrich (III) Christian (V) Friedrich (IV)
1730-1746 1746-1766 1766-1773	Christian (VI) Friedrich (V) Christian (VII)
Holstein-Gottorp Line Duchy 1777-1815 and thereafter grand duchy
1773-1785 1785-1810 1810-1813 1813-1823 1823-1829 1829-1853 1853-1900 1900-1918 1918-1945 1946-	Friedrich August * Peter Friedrich Wilhelm * Part of France Peter Friedrich Wilhelm (restored) Peter Friedrich Ludwig Peter Friedrich August Nikolaus Friedrich Peter Friedrich August Republic Part of Niedersachsen
County of Delmenhorst
1278-1301 1301-1346 1346- ? 1346- ? 1346-1368 1368-1423 1423-1438 1438-1440 1440-1464 1464-1482 1482-1483 1483-1547 1547-1577 1577-1619 1619-1622 1622-1647 1647-	Otto III Christian IV Johann XII Christian V Otto IV Otto V Nikolaus (Archbishop of Bremen) United with Oldenburg Moritz Jakob United with Oldenburg Part of the prince bishopric of Münster United with Oldenburg Anton II Anton Heinrich Christian IX United with Oldenburg

* = Friedrich August and Peter Friedrich Wilhelm were prince bishops of Lübeck 1750-1785 respectively 1785-1802. This prince bishopric was secularised 1803 and united with Oldenburg. After World War Two was it incorporated with Schleswig-Holstein.

= Denmark

= Norway

= Schleswig-Holstein

= Jever