Eilika of Saxony

Eilika of Saxony was the younger daughter of Magnus, Duke of Saxony and Sophia , a daughter of Bla I of Hungary. After the death of her father, she became the heiress of Werben and the Palatinate of Saxony. She married Count Otto of Ballenstedt and was the mother of Albert the Bear and Adelheid, who married Henry II, Margrave of the Nordmark.

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Source: Wikipedia