In the summer of 1202 in Hamburg, Princess Helena married Duke William of Lüneburg (1184-1213), so she became the daughter-in-law of Duke Henry the Lion of Saxony and his English wife Princess Matilda.
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After the early death of her husband, Duke William, in 1213, her brother Emperor Otto IV took over the reign of Lüneburg, as regent for William's son Otto the Child.
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Helena and William had one son, the future Duke, Otto I the child of Brunswick-Lüneburg (1204-1252).
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