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Derrick or Dietrich of Oldenburg, Latin-based Anglicisation also Theoderic of Oldenburg (c. 1398 – 14 February 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 was the father of Christian I of Denmark, a male-line ancestor to the present-day Danish throne under Margarethe II of Denmark as well as the last Czar of imperial Russia, Nicolas II. He is also the male line ancestor of Charles, Prince of Wales and Harald V of Norway. ==Lineage== Dietrich of Oldenburg was the son of Christian V of Oldenburg (who became count in about 1398 and died in 1423) and his wife, Countess Agnes of Honstein (c. 1410–1460). His grandfather, Conrad I of Oldenburg (d. ''ca.'' 1368) had left his lands divided between Dietrich's father and uncle, Conrad II. Dietrich’s father, Christian V, managed to gain the upper hand when Conrad II's son Maurice II 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 that 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 of her only brother in 1350, 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 Holstein-Plön), 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Dietrich, Count of Oldenburg」の詳細全文を読む スポンサード リンク
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