Monarchy of Oldenburg
State
Details
Style	His Royal Highness
First monarch	Elimar I (As Count)
Last monarch	Frederick Augustus II (As Grand Duke)
Formation	1101
Abolition	9 November 1918
Residence	Rastede Castle
Pretender(s)	Christian

This is a list of the counts, dukes, grand dukes, and prime ministers of Oldenburg.

Counts of Oldenburg

• 1088^[1]/1101–1108 Elimar I
• 1108–1143 Elimar II
• 1143–1168 Christian I the Quarrelsome
• 1168–1211 Maurice I
• 1209–1251 Otto I, joint rule with Christian II and later with John I
• 1211–1233 Christian II
• 1233–1272 John I
• 1272–1278 Christian III
• 1272–1301 Otto II, Count of Oldenburg-Delmenhorst
• 1278–1305 John II
• 1302–1323 Christian IV
• 1305–1345 John III
• 1331–1356 John IV
• 1345–1347 Conrad I
• 1368–1386 Conrad II
• 1386–1420 Maurice II
• 1368–1398 Christian V
• 1398–1423 Christian VI
• 1423–1440 Dietrich the Lucky
• 1440–1448 Christian VII
• 1448–1483 Gerhard VI "the Quarrelsome"
• 1483–1500 Adolph, Count of Oldenburg-Delmenhorst
• 1500–1526 John V
• 1526–1529 John VI, joint rule with his brothers George, Christopher and Anthony I, forced to resign in 1529
• 1526–1529 George, joint rule with his brothers John VI, Christopher and Anthony I, forced to resign in 1529
• 1526–1566 Christopher, joint rule with his brothers John VI, George and Anthony I
• 1526–1573 Anthony I, joint rule with his brothers John VI, George and Christopher
• 1573–1603 John VII
• 1573–1619 Anthony II, Count of Oldenburg-Delmenhorst
• 1603–1667 Anthony Günther
• 1667–1670 Frederick I, in personal union as Frederick III King of Denmark-Norway
• 1670–1699 Christian VIII, in personal union as Christian V King of Denmark-Norway
• 1699–1730 Frederick II, in personal union as Frederick IV King of Denmark-Norway
• 1730–1746 Christian IX, in personal union as Christian VI King of Denmark-Norway
• 1746–1766 Frederick III, in personal union as Frederick V King of Denmark-Norway
• 1766–1773 Christian X, in personal union as Christian VII King of Denmark-Norway, ceded the county to the Holstein-Gottorp line
• 1773 Paul I, ceded the county to his cousin of the Holstein-Gottorp line
• 1773–1774 Frederick Augustus I (elevated to Duke in 1774), in personal union Prince-Bishop of Lübeck

Dukes of Oldenburg

Name	Portrait	Birth	Marriage(s)	Death
Frederick Augustus I 1774–6 July 1785		20 September 1711 Gottorp, Schleswig son of Christian August of Holstein-Gottorp and Albertina Frederica	Ulrike Friederike Wilhelmine of Hesse-Kassel Kassel 21 November 1752 three children	6 July 1785 Oldenburg aged 73
William, Duke of Oldenburg 1785–1810		3 January 1754 Eutin son of Frederick August I and Ulrike	Never married	2 July 1823 Schloss Plön aged 69

To France in 1810–1813

Name	Portrait	Birth	Marriage(s)	Death
William, Duke of Oldenburg 1813–2 July 1823		3 January 1754 Eutin son of Frederick Augustus I and Ulrike	Never married	2 July 1823 Schloss Plön aged 69

Grand Dukes of Oldenburg

Name	Portrait	Birth	Marriage(s)	Death
Peter I 1823–21 May 1829		17 January 1755 Rastede nephew of Frederick Augustus I and cousin of William	Frederica of Württemberg 6 June 1781 two children	21 May 1829 Oldenburg aged 74
Augustus I 1829–27 February 1853		13 July 1783 Rastede son of Peter I and Friederike	Adelheid of Anhalt-Bernburg-Schaumburg-Hoym 24 July 1817 two children Ida of Anhalt-Bernburg-Schaumburg-Hoym 24 June 1825 one child Cecilia of Sweden 5 May 1831 three children	27 February 1853 Oldenburg aged 69
Peter II 1853–13 June 1900		8 July 1827 Oldenburg son of Augustus I and Ida	Elisabeth of Saxe-Altenburg 10 February 1852 two children	13 June 1900 Rastede aged 72
Frederick Augustus II [2] 1900–11 November 1918		16 November 1852 Oldenburg son of Peter II and Elisabeth	Elisabeth Anna of Prussia 18 February 1878 two children Elisabeth of Mecklenburg-Schwerin 24 October 1896 5 children	24 February 1931 Rastede aged 78

Full style

• Grand Duke of Oldenburg, Heir in Norway, Duke of Schleswig, Holstein, Stormarn, Ditmarshes & Oldenburg, Prince of Lübeck and Birkenfeld, Lord of Jever and Kniphausen

Prime ministers of the Republic of Oldenburg

• 1918–1919 Bernhard Kuhnt (USPD)
• 1919–1923 Theodor Tantzen (DDP)
• 1923–1930 Eugen von Finckh (no party)
• 1930–1932 Friedrich Cassebohm
• 1932–1933 Carl Röver (NSDAP)
• 1933–1945 Georg Joel (NSDAP)
• 1945–1946 Theodor Tantzen (FDP)

To Lower Saxony in 1946