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

Family 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