Svend II

...The royal family that arose in Jelling was Christianized around 970 under the rule of Harald Blåtand (r. 935-985), and his son Svend I conquered England and became its king (1014). His second son, Cnut II, became king of England in 1016, and after the death of his brother Harald II in 1018, he also became king of Denmark. In 1028, he was also crowned king of Norway, making the country king of three kingdoms (known as the North Sea Empire). Svend II (r. 1047-74), son of Cnut's sister Estrid, established the domestic order that led to modern Denmark during his reign, and later kings would trace their lineage back to him in some way. His grandson entered into a civil war over the throne, which ended in 1157 when Valdemar I became sole king.

*Some of the terminology that mentions "Svend II" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…やがてイェリングの地で興った王家は，970年ころハーラル青歯王Harald Blåtand(在位935ころ‐985ころ)治下で王国をキリスト教化し，その子スベン1世がイングランドを征服しその王を兼ね(1014)，その次男クヌット2世が1016年イングランド王位に就き，18年兄ハーラル2世の没後はデンマーク王を兼ね，さらに28年ノルウェー王にも推戴され，3王国の王となった(これは北海帝国と呼ばれる)。クヌットの姉エストリドの子スベン2世Svend II(在位1047‐74)は，その統治期間中に現代のデンマークにつながる内政的秩序を打ち立て，後の王はなんらかの形で彼に血統をさかのぼらせることになる。彼の孫の代で王位をめぐる内戦状態に入り，1157年バルデマー1世が唯一の王となり，内戦を終結させた。…

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出典｜株式会社平凡社世界大百科事典 第２版について | 情報