- Dietrich, Count of Oldenburg
Dietrich of Oldenburg Count of Oldenburg Predecessor Christian V of Oldenburg Successor King Christian I of Denmark Spouse Countess Adelheid of Oldenburg-Delmenhorst, Issue King Christian I of Denmark,
Maurice, Gerhard, Adelheid
House House of Oldenburg Father Christian V of Oldenburg Mother Countess Agnes of Honstein Born c. 1398 Died February 14, 1440
Derrick or Dietrich of Oldenburg, Latin-based anglicization also Theoderic of Oldenburg  (c. 1398 – February 14, 1440), nicknamed Theoderic the Lucky or the Fortunate (Teudericus Fortunatus), was a feudal lord in northern Germany, holding the counties of Delmenhorst and Oldenburg. He was called "Fortunatus" as he was able to secure Delmenhorst for his branch of the Oldenburgs.
Dietrich is the father of Christian I of Denmark, a male-line ancestor to the present-day Danish throne under Margaret II of Denmark as well as the last czar of imperial Russia, Nicolas II. He is also a male line ancestor of Charles, Prince of Wales as well as William, Duke of Cambridge and Prince Harry of Wales.
Dietrich of Oldenburg was the son of Count Christian V of Oldenburg (who became count in about 1398 and died in 1423) and his wife, Countess Agnes of Honstein. His grandfather, Count Conrad I of Oldenburg (d. ca. 1368) had left his lands divided between his father and his uncle Conrad II.
Dietrich’s father, Christian V, managed to gain the upper hand when Conrad II's son Maurice IV died in 1420. After this, most of the Oldenburg family patrimony was under the power of Dietrich’s branch. However, the house had several minor branches who had estates and claims, as was usual in any medieval fief.
Dietrich of Oldenburg was the grandson of Ingeborg of Itzehoe, a Holstein princess who had married count Conrad I of Oldenburg. After the death in 1350 of her only brother, Count Gerhard V of Holstein-Itzehoe-Plön, Ingeborg and her issue were the heirs of her own grandmother Ingeborg of Sweden (d. ca. 1290, first wife of Gerhard II of Plön-Itzehoe), the eldest daughter of King Valdemar of Sweden and Queen Sophia, who herself was the eldest daughter of the sonless King Eric IV of Denmark and his wife Jutta of Saxony. Since other legitimate descent from King Valdemar apparently was extinct by this time, Dietrich was considered the heir general of Kings Valdemar I of Sweden and Eric IV of Denmark.
Dietrich succeeded his father as head of the House of Oldenburg in 1423.
Marriages and children
He had firstly, as a child, married (for reasons of succession and uniting the hereditary fiefs) a distant cousin, Countess Adelheid of Oldenburg-Delmenhorst (who is said to have died already in 1404), daughter of Oldenburg Count Otto IV of Delmenhorst, and in 1423 he married for a second time, Helvig of Schauenburg (born in about 1398-1400, died 1436), widow of Prince Balthasar of Mecklenburg and daughter of the murdered Duke Gerhard VI of Schleswig-Holstein and his wife Elisabeth of Brunswick, thus sister of the reigning Duke Adolf VIII. All his legitimate children were born of the second wife.
At this time, all Scandinavia lived under the Kalmar Union erected by Queen Margaret I of Denmark. In 1387 she had lost her own heir Olav IV of Norway, the new heirs now being Eric of Pomerania, and his sister Catherine who was married with a prince of the Palatinate and Bavaria.
Count Theodoric of Oldenburg is said to have been a rival claimant to the crowns of Sweden and Denmark during the reign of Eric VII/ Eric XIII, whose succession was through Christopher I of Denmark, the younger brother of the murdered Eric IV, and through Magnus I of Sweden, younger brother of the deposed King Valdemar.
Count Theodoric had three surviving sons and one daughter:
- Christian (1426–1481), who succeeded him as Count of Oldenburg and Delmenhorst, and became later King Christian I of Denmark, Norway and Sweden, as well as Duke of Schleswig and Holstein.
- Maurice (1428–1464); when his elder brother became king, he was given the County of Delmenhorst.
- Gerhard (1430–1500); when his eldest brother had become king, he was given the county of Oldenburg, and from his other brother's heirs he also inherited Delmenhorst in about 1483. The third son got his name from usages of the mother's Holstein clan.
- Adelheid (1425–1475), first married count Ernest III of Hohnstein (d. 1454) and then in 1474 Count Gerhard VI of Mansfeld (d. 1492).
Male Line of Descendants
Dietrich of Oldenburg is a direct ancestor to the Danish royal family and its derivatives, the British Royal Family, the pretenders to the Kingdom of the Hellenes, the Norwegian royal family, and the last Russian czars of Romanov-Holstein-Gottorp.
Ancestors of Dietrich, Count of Oldenburg 16. Christian III, Count of Oldenburg 8. John II, Count of Oldenburg 17. Hedwig of Oldenburg-Wildeshausen 4. Conrad I, Count of Oldenburg 18. Conrad, Count of Diepholz 9. Hedwige von Diepholz 2. Christian V, Count of Oldenburg 20. Gerhard II, Count of Holstein-Itzehoe-Plön 10. Gerhard IV, Count of Holstein-Itzehoe-Plön 21. Ingeborg of Sweden 5. Ingeborg of Itzehoe 22. Nikolaus I, Count of Schwerin in Wittenburg 11. Anastasia von Wittenberg 23, Miroslawa of Pomerania 1. Dietrich, Count of Oldenburg 12. Dietrich III of Honstein 6. Dietrich V or VI, Count of Hohnstein-Heringen 13. Elisabeth of Waldeck 3. Agnes von Hohnstein-Heringen 28. Albert II, Duke of Brunswick-Lüneburg 14. Magnus the Pious, Duke of Brunswick-Lüneburg 29. Rixa of Mecklenburg-Werle 7. Sophie of Brunswick 30. Henry I, Margrave of Brandenburg 15. Sophie of Brandenburg 31. Agnes of Bavaria
Dietrich, Count of Oldenburg
- ^ Alternate names include:
Regnal titles Preceded by
Count of Oldenburg
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