Helena of Denmark
|Spouse(s)||William of Winchester|
|Noble family||House of Estridsen|
|Father||Valdemar I of Denmark|
|Mother||Sophia of Minsk|
22 November 1233|
|Buried||Benedictine monastery of St. Michael in Lüneburg|
In the summer of 1202 in Hamburg, Helena married Duke William of Lüneburg (1184–1213), so she became the daughter-in-law of Henry the Lion of Saxony and his English wife Matilda. Helena and William had one son, the future Duke, Otto I, The Child of Brunswick-Lüneburg (1204–1252). 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. Otto was appointed heir of the allodial property of the Guelphs by his uncle Henry the Elder.
Duchess Helene died in 1233 and was buried in the Benedictine monastery of St. Michael in Lüneburg.