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Male Otto I von Brunswick , Duke of Luneburg Click to view Otto I von Brunswick , Duke of Luneburg in the family tree

Otto I von was born in 1204 in Braunschweig, Brunswick, Germany.  Otto I von's father was Wilhelm von Brunswick and his mother was Helene of Denmark.  His paternal grandparents were Henry V "The Lion" Duke of Saxony & Bavaria and Matilda Princess of England; his maternal grandparents were Valdemar I Knudsen and Sofiya Vladimoroyna of Novgorod.  He was an only child.  He died at the age of 48 on July 9th, 1252.


Otto I von's family with Mathilde von Brandenburg

‌Otto I von and Mathilde von were married in a religious ceremony in 1228.  They had a son named Albrecht I von.

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