Eric I, Duke of Brunswick-Grubenhagen

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Eric I, Duke of Brunswick-Grubenhagen
Spouse(s) Elisabeth of Brunswick-Göttingen
Noble family House of Guelph
Father Albert I, Duke of Brunswick-Grubenhagen
Mother Agnes I of Brunswick-Lüneburg
Born c. 1383
Died 28 May 1427(1427-05-28)

Eric I, Duke of Brunswick-Grubenhagen nicknamed the winner (German: Erich I., Herzog von Braunschweig-Grubenhagen; c. 1383 – 28 May 1427), ruled the Principality of Grubenhagen, a part of the Duchy of Brunswick-Lüneburg.

Life

Eric was the only son of the Duke Albert I of Brunswick-Grubenhagen, who died in 1383, and his wife Agnes I, a daughter of Duke Magnus II of Brunswick-Lüneburg. Eric inherited Brunswick-Grubenhagen at a very early age; he stood until 1401 under the guardianship of his uncle, Duke Frederick of Grubenhagen-Osterode. From 1402 they joined ruled the principality and Eric moved his residence to Salzderhelden.

Disputes arose with his cousins Bernard I and Frederick I of Lüneburg, with the city of Brunswick, with his former guardian, with the counts of Schwarzburg and the Landgrave of Thuringia. All these disputes were soon settled again.

In 1406 Eric was captured in a feud with the Lords of Hardenberg in Lindau. He was only released after he gave them a written Urfehde and the city of Osterode am Harz as collateral.

In 1415 Eric declared war on the Counts of Hohenstein, because both sides claimed the county of Bad Lauterberg im Harz and defeated them near the village of Osterhagen. Count Guenther of Hohnstein died during the battle; Counts Henry and Ernest were captured and had to pay 8000 florins and renounce their claims to redeem themselves.

A dispute with the Lords of Bortfeld was settled soon after Eric entered into an alliance against them with the City of Brunswick. A dispute with Landgrave Frederick "the Peaceful" of Thuringia about the city of Einbeck was also settled quickly.

In 1422, the Abbess of Gandersheim Abbey (who happened to be his daughter Agnes II of Brunswick-Grubenhagen) enfeoffed him with castle and city of Elbingerode. In 1424, the Abbess of Quedlinburg Abbey, Countess Adelheid of Isenburg), enfeoffed the Dukes of Grubenhagen with Duderstadt, Gieboldehausen and the Golden Mark.

Eric was married to Elisabeth, a daughter of Duke Otto I "the Angry" of Brunswick-Göttingen. They had three sons and five daughters. His sons Henry III and Albert II succeeded him; Ernest became provost of the St. Alexandri minster in Einbeck.

Ancestors

Family of Eric I, Duke of Brunswick-Grubenhagen
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
16. Albert I, Duke of Brunswick-Lüneburg
 
 
 
 
 
 
 
8. Henry I, Duke of Brunswick-Grubenhagen
 
 
 
 
 
 
 
 
 
 
 
17. Adelaide of Montferrat
 
 
 
 
 
 
 
4. Ernest I, Duke of Brunswick-Grubenhagen
 
 
 
 
 
 
 
 
 
 
 
 
 
 
18. Albert II, Margrave of Meissen
 
 
 
 
 
 
 
9. Agnes of Meissen
 
 
 
 
 
 
 
 
 
 
 
19. Margaret of Sicily
 
 
 
 
 
 
 
2. Albert I, Duke of Brunswick-Grubenhagen
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
20. Otto of Everstein-Polle
 
 
 
 
 
 
 
10. Henry II of Everstein-Polle
 
 
 
 
 
 
 
 
 
 
 
21. Luitgard of Schladen
 
 
 
 
 
 
 
5. Adelaide of Everstein-Polle
 
 
 
 
 
 
 
 
 
 
 
 
 
 
22. Simon I, Lord of Lippe
 
 
 
 
 
 
 
11. Adelaide of Lippe
 
 
 
 
 
 
 
 
 
 
 
23. Adelaide of Waldeck
 
 
 
 
 
 
 
1. Eric I, Duke of Brunswick-Grubenhagen
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
24. Albert II, Duke of Brunswick-Lüneburg
 
 
 
 
 
 
 
12. Magnus the Pious, Duke of Brunswick-Lüneburg
 
 
 
 
 
 
 
 
 
 
 
25. Rixa of Werle
 
 
 
 
 
 
 
6. Magnus II, Duke of Brunswick-Lüneburg
 
 
 
 
 
 
 
 
 
 
 
 
 
 
26. Henry I, Margrave of Brandenburg-Stendal
 
 
 
 
 
 
 
13. Sophie of Brandenburg-Stendal
 
 
 
 
 
 
 
 
 
 
 
27. Agnes of Bavaria
 
 
 
 
 
 
 
3. Agnes of Brunswick-Lüneburg
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
28. Bernhard II, Prince of Anhalt-Bernburg
 
 
 
 
 
 
 
14. Bernhard III, Prince of Anhalt-Bernburg
 
 
 
 
 
 
 
 
 
 
 
29. Helene of Rügen
 
 
 
 
 
 
 
7. Catherine of Anhalt-Bernburg
 
 
 
 
 
 
 
 
 
 
 
 
 
 
30. Rudolf I, Duke of Saxe-Wittenberg
 
 
 
 
 
 
 
15. Agnes of Saxe-Wittenberg
 
 
 
 
 
 
 
 
 
 
 
31. Judith of Brandenburg-Salzwedel
 
 
 
 
 
 

References and sources

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Eric I, Duke of Brunswick-Grubenhagen
Born: around 1383 Died: 28 May 1427
Preceded by Duke of Brunswick-Lüneburg
Prince of Grubenhagen

1383–1427
Succeeded by
Henry III

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