William I, Duke of Brunswick-Lüneburg

William (c. 1270 – 30 September 1292, in Brunswick), Duke of Brunswick-Lüneburg, briefly ruled part of the duchy.

William was the third son of Albert I, Duke of Brunswick-Lüneburg. On Albert's death on 1279, the three eldest brothers succeeded him, but were put under guardianship of Conrad, Prince-Bishop of Verden. After they reached majority, they divided the territory among each other in 1291: William received the northern part of their father's state, including Brunswick, Schöningen, the Harzburg, Seesen, and Königslutter. The brothers disagreed over control of the City of Brunswick.

Only a year later, William died, and his brothers divided his territory among each other. He had married Elizabeth, daughter of Henry I, Landgrave of Hesse, but the marriage apparently remained childless.

Ancestry

Ancestors of William I, Duke of Brunswick-Lüneburg

16. Henry the Lion               8. William of Winchester, Lord of Lüneburg                       17. Matilda of England               4. Otto I, Duke of Brunswick-Lüneburg                             18. Valdemar I of Denmark               9. Helena of Denmark                       19. Sophia of Minsk               2. Albert I, Duke of Brunswick-Lüneburg                                   20. Otto I, Margrave of Brandenburg               10. Albert II, Margrave of Brandenburg                       5. Matilda of Brandenburg                             22. Conrad II, Margrave of Lusatia               11. Matilda of Lusatia                       23. Elisabeth of Greater Poland               1. William I, Duke of Brunswick-Lüneburg                                         24. Boniface I, Marquess of Montferrat               12. William VI, Marquess of Montferrat                       25. Helena del Bosco               6. Boniface II, Marquess of Montferrat                             26. Bonifacio di Clavesana, Count of Cortemiglia               13. Berta di Clavesana                       3. Adelheid of Montferrat                                   28. Thomas I, Count of Savoy               14. Amadeus IV, Count of Savoy                       29. Margaret of Geneva               7. Margaret of Savoy                             30. Hugh III, Duke of Burgundy               15. Marguerite of Burgundy                       31. Beatrice of Albon

References

• Braunschweigisches Biographisches Lexikon, Appelhans 2006, ISBN 3-937664-46-7