County of Oldenburg

History

Origins and early expansion (1108-1448)

The town was first mentioned in 1108, at that time known under the name of Aldenburg. It became important due to its location at a ford of the navigable Hunte river. Oldenburg became a small county in the shadow of the much more powerful Free Hanseatic City of Bremen.

The earliest recorded inhabitants of the region now called Oldenburg were a Teutonic people- the Chauci. The genealogy of the counts of Oldenburg can be traced to the Saxon hero Widukind (opponent of Charlemagne), but their first historical representative was Huno of Rustringen (died 1088, founded the monastery of Rastede in 1059). Huno's descendants appear as vassals of the dukes of Saxony and were occasionally rebellious. They were given the title of princes of the Empire when the emperor Frederick I dismembered the Saxon duchy in 1189. At this time the county of Delmenhorst formed part of the dominions of the counts of Oldenburg, but afterwards it was on several occasions separated from them to form an appanage for younger branches of the family, namely in ca. 1266-1436, 1463-1547, and 1577-1617.

The northern and western parts of what would become the Grand Duchy of Oldenburg were in the hands of independent, or semi-independent, Frisian princes, who were usually pagan, and the counts of Oldenburg seized much of these lands in a series of wars during the early part of the 13th century. The Free Hanseatic City of Bremen and the bishop of Münster also frequently warred with the counts of Oldenburg.

Personal Union with Denmark (1448-1460)

In 1448, the 31-year-old King of Denmark, Christopher III, died unexpectedly and without heirs. Owing to the Kalmar Union, he had also been King of Norway and Sweden. The union treaty required the three kingdoms to choose a successor jointly, but tensions between Denmark and Sweden precluded negotiations. When the Swedish Privy Council allowed Karl Knutsson to be crowned King of Sweden, the Danish Privy Council sought an alternative candidate. Their first choice, Duke Adolf VIII of Schleswig and Holstein, declined but recommended his nephew Christian, the young Count of Oldenburg, who had been raised at his court.

Following Adolf’s recommendation, the Danish Privy Council elected Christian king in September 1448. In 1449 he was also elected King of Norway, and the two kingdoms were formally united in 1450 with the Treaty of Bergen. Finally, after the deposition of Karl Knutsson in 1457, Christian also gained the Swedish crown.

During Christian’s early reign, Oldenburg became a Danish exclave. For centuries thereafter, Oldenburg and its rulers would be more closely aligned with Denmark and its foreign policy than with imperial structures or the Holy Roman Emperors. In Christian’s absence, effective control over the town was left to his brothers, Gerhard and Moritz, who established a short-lived tyranny.

Independent County (1460-1667)

In 1459, King Christian stood to inherit the Duchy of Schleswig and the County of Holstein from his uncle, Adolf VIII—a development that significantly shaped Oldenburg’s future. To prevent the separation of the two territories, the nobles of Holstein and Schleswig invited Christian to rule as Duke of Schleswig and Count of Holstein. In return, Christian granted the nobles extensive privileges in the Treaty of Ribe. He also agreed to renounce his hereditary claim to Oldenburg.

Christian transferred Oldenburg to his brother Gerhard, thereby giving Oldenburg independence from the Danish crown. Gerhard waged continual conflicts with the Bishop of Bremen and other neighbors, earning himself a reputation as a pirate in the eyes of the Hanseatic League. In 1483, however, Gerhard was compelled to abdicate in favor of his son, and he later died while on a pilgrimage in Spain.

Early in the 16th century, Oldenburg was again enlarged at the expense of the Frisians. Protestantism was introduced into the county by Count Anton I (1505–1573), who also suppressed the monasteries. However, he remained loyal to Charles V during the war of the League of Schmalkalden, and was able thus to increase his territories, obtaining Delmenhorst in 1547. One of Anton's brothers, Count Christopher of Oldenburg (c. 1506-1560) also won a reputation as a soldier.

Anton's grandson, Anton Günther (1583–1667), who succeeded in 1603 significantly enlarged and enriched his territories. He thus considered himself the wisest prince who ever had ruled Oldenburg. Jever had been acquired before his ascension, but in 1624 he added Knipphausen and Varel to his lands; thus, in 1647 Delmenhorst was finally united. Through neutrality during the Thirty Years' War and by donating valuable horses to warlord Count of Tilly, Anton Günther protected his dominions from the devastation levied on nearly all other German states. He also obtained from the emperor the right to levy tolls on vessels passing along the Weser, a lucrative grant. In 1607 he erected a Renaissance castle. Oldenburg was a wealthy town in a time of war and turmoil and its population and power grew considerably.

Danish Oldenburg (1667-1773)

Anton Günther, having no legitimate children to keep the main line of his House from going extinct, arranged an agreement with the prospective successors of the county, King Frederick III of Denmark and Duke Christian Albrecht of Holstein-Gottorp. It was decided that Oldenburg would pass jointly to them, while Günther’s illegitimate but ennobled son, Anton von Aldenburg, would serve as governor on their behalf. Upon Günther’s death in 1667, Anton von Aldenburg assumed control of the county, but internal conflicts within the House of Holstein-Gottorp allowed only the Danish crown to assert its inheritance rights effectively. After von Aldenburg’s death in 1680, Danish officials occupied the residence in Oldenburg, formally integrating the county into Denmark’s administrative system under the authority of the German Chancellery in Copenhagen.

The period of Danish rule was marked by repeated crises. Two plague outbreaks in 1667 and 1668 decimated the population and weakened the economy, while in 1676 a fire caused by lightning destroyed 700 houses and left 3,000 people homeless. Von Aldenburg’s financial aid did little to accelerate recovery, which was further impeded by the Scanian War. Danish troops were quartered in Oldenburg and financed partly through local taxation, while their competition for work depressed wages in the town. Following von Aldenburg’s death, reforms were introduced by Chancellor Christoph Gensch von Breitenau (1681–1701) to modernize local administration and stabilize the economy. Despite these measures, Oldenburg remained a strategic rather than economic asset for Denmark, serving as a military quarter during the Great Northern War and the Seven Years’ War at considerable cost to the population.

Weak finances also hampered dyke maintenance in the low-lying areas of the county. The Christmas Flood of 1717 killed more than 4,000 people in Oldenburg and left large tracts of land uncultivable, while the New Year’s Flood of 1720 destroyed many of the emergency dykes erected in the aftermath. King Frederick IV, who had initiated coastal protection measures in 1714, expanded these efforts after 1717 by granting loans for improved dyke construction. Reconstruction was carried out under the supervision of former admiral Christian Thomesen Sehested and included the rebuilding of parts of Oldenburg town. Only in the mid-18th century did the county’s economy recover sufficiently to yield a net fiscal benefit to the Danish treasury.

Independence and elevation to duchy (1773-1774)

In the 1770s, Oldenburg suddenly stood at the center of European diplomacy. Back in 1544, king Christian III of Denmark, from the House of Oldenburg, divided the rule over Schleswig and Holstein with his brothers Johann and Adolf. From Adolf’s branch came the Dukes of Schleswig-Holstein-Gottorf, who also ruled the Prince-Bishopric of Lübeck.

During the Great Northern War, Georg Heinrich von Görtz governed Schleswig and Holstein in the name of the young Duke Karl Friedrich of Gottorf. Seeking to strengthen his position, he allied with Sweden against Denmark. In response, the Danish king annexed parts of Schleswig in 1713.

Karl Friedrich, weakened by this loss, turned to Russia for support. In 1725 he married Anna, daughter of Tsar Peter I. Their son later became Tsar Peter III in 1762. From the Russian throne he pressed his family’s claims to Schleswig and threatened Denmark with war. But after Peter III’s sudden death only six months later, his widow, Catherine II, looked for a diplomatic solution.

thumb|Guard house and the Lamberti-Church

This was achieved in 1773 with the Treaty of Tsarskoye Selo: Denmark received Schleswig and Holstein, while Oldenburg was transferred to Catherine’s son Paul. He soon passed it on to his great-uncle, Friedrich August, Prince-Bishop of Lübeck. From that point, Friedrich August ruled Oldenburg as an independent territory, first as Count and, from 1774, as Duke. For Denmark, which was losing its status as a major European power, keeping the small and economically weak Oldenburg was less important than securing its southern border with Schleswig and avoiding conflict with Russia. For the newly independent Oldenburg, dynastic connections to Denmark gradually mattered less, while relationships with the Russian dynasty—and later political ties with Prussia—became increasingly important.

During the reign of Friedrich August, Oldenburg regained its importance as a dynastic residence. Following the destruction of earlier structures, the city was reshaped with new buildings in the Classical style.

Rulers

[[House of Oldenburg]]

Partitions of Oldenburg under House of Oldenburg rule

Table of rulers

Notes

References

References

1. [https://europeanroyalhistory.wordpress.com/2023/01/24/the-life-of-dietrich-count-of-oldenburg The town of Oldenburg was first mentioned in 1108, at that time known under the name of Aldenburg. It became important due to its location at a ford of the navigable Hunte River. Oldenburg became a small county in the shadow of the much more powerful Free Hanseatic City of Bremen.]
2. [https://theodora.com/encyclopedia/o/oldenburg_germany_grandduchy.html The earliest recorded inhabitants of the district now called Oldenburg were a Teutonic people, the Chauci, who were afterwards merged in the Frisians. The chroniclers delight in tracing the genealogy of the counts of Oldenburg to the Saxon hero, Widukind, the stubborn opponent of Charlemagne, but their first historical representative is one Elimar (d. 1108) who is described as comes in confinio Saxoniae et Frisiae. Elimar's descendants appear as vassals, although sometimes rebellious ones, of the dukes of Saxony; but they attained the dignity of princes of the empire when the emperor Frederick I. dismembered the Saxon duchy in 1180. At this time the county of Delmenhorst formed part of the dominions of the counts of Oldenburg, but afterwards, it was on several occasions separated from them to form an apanage for younger branches of the family. This was the case between 1262 and 1447, between 1463 and 1547, and between 1577 and 1617. The northern and western parts of the present grand-duchy of Oldenburg were in the hands of independent, or semi-independent, Frisian princes, who were usually heathens, and during the early part of the 13th century, the counts carried on a series of wars with these small potentates which resulted in a gradual expansion of their territory. The free city of Bremen and the bishop of Munster were also frequently at war with the counts of Oldenburg.]
3. [https://europeanroyalhistory.wordpress.com/2023/01/24/the-life-of-dietrich-count-of-oldenburg The earliest recorded inhabitants of the region now called Oldenburg were a Teutonic people- the Chauci. The genealogy of the counts of Oldenburg can be traced to the Saxon hero Widukind (opponent of Charlemagne) but their first historical representative was Huno of Rustringen (died 1088, founded the monastery of Rastede in 1059). In the Holy Roman Empire Oldenburg was a county that developed around the settlement of Oldenburg, (first attested in 1108) and in the course of history gained control of a wider area. The Counts of Oldenburg stemmed from a Frisian princely house. Huno’s descendants appear as vassals of the Welf Saxon Duke Heinrich III-XII the Lion, Duke of Saxony and Duke of Bavaria, they took advantage of his deposition by Emperor Friedrich I Barbarossa to make themselves autonomous. They were given the title of princes of the Empire when Friedrich I Barbarossa dismembered the Saxon duchy in 1189. The first Oldenburgs belonged to the line of the Rüstringen Frisians.]
4. Hinrichs, Ernst and Christoph Reinders (1987): ‘Zur Bevölkerungsgeschiche des Oldenburger Landes,’ pp. 661–708 in Albrecht Eckhardt and Heinrich Schmidt (ed.), Geschichte des Landes Oldenburg, Oldenburg: Holzberg.
5. (2025-08-25). "Die Oldenburgische Flagge". [[Oldenburgische Landschaft]].
6. [https://www.loc.gov/resource/g3200m.gct00035/?sp=41&r=-0.069,-0.412,1.111,1.396,0 Le theatre du monde, ou, Novvel atlas. Atlases Netherlands Early works to 1800, Earth]
7. {{EB1911
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10. [http://www.geschichte-online.info/04_05_Brandenburg-Preussen.pdf Oldenburg]
11. {{EB1911
12. Nistal, Matthias. (2007). "Die wechselhaften Beziehungen zwischen Oldenburg und Dänemark". Oldenburger Jahrbuch.
13. Nistal, Matthias. (2007). "Die wechselhaften Beziehungen zwischen Oldenburg und Dänemark". Oldenburger Jahrbuch.
14. Nistal, Matthias. (2007). "Die wechselhaften Beziehungen zwischen Oldenburg und Dänemark". Oldenburger Jahrbuch.
15. {{EB1911
16. Nistal, Matthias. (2007). "Die wechselhaften Beziehungen zwischen Oldenburg und Dänemark". Oldenburger Jahrbuch.
17. {{EB1911
18. {{EB1911
19. {{EB1911
20. Nistal, Matthias. (2007). "Die wechselhaften Beziehungen zwischen Oldenburg und Dänemark". Oldenburger Jahrbuch.
21. Nistal, Matthias. (2007). "Die wechselhaften Beziehungen zwischen Oldenburg und Dänemark". Oldenburger Jahrbuch.
22. Nistal, Matthias. (2007). "Die wechselhaften Beziehungen zwischen Oldenburg und Dänemark". Oldenburger Jahrbuch.
23. {{EB1911
24. Despite being called ''dukes'', the true domain of the rulers of Sonderburg and its divisions was restricted to their respective castles, manors and/or estates. Therefore, for distinction between other branches of dukes who actually held duchies as larger territories, the Sonderburg branches will be called ''Lords''.
25. Annexed to Schleswig in 1779, and to Beck in 1825.
26. Contrarily to the previous branches of Delmenhorst and Wildenhausen, it is known that this specific branch of Delmenhorst followed the numbering of the main County of Oldenburg.
27. Sometimes numbered ''Gerhard VI''.
28. More often named ''Holstein-Gottorp'' after the capital of the duchy at Gottorp.
29. Huberty, Michel. (1994). "L'Allemagne Dynastique Tome VII Oldenbourg".
30. [http://www.freundeskreis-schloss-ulenburg.de/index.php?option=com_content&view=article&id=46&Itemid=55 Geschichte des Haus Ulenburg], Retrieved 2014-03-21
31. "Christian IX". Official website of the Danish Monarchy.
32. (June 14, 1900). "Grand Duke of Oldenburg Dead. Connected with Russian Imperial Family. His Military Services.". [[The New York Times]].