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

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References

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

Preceded by Albert I	Duke of Brunswick-Lüneburg, Prince of Brunswick 1279–1292, until 1291 jointly with Henry I and Albert II	Succeeded by Henry I and Albert II

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