Henry I, Duke of Brunswick-Grubenhagen

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Henry I the Admirable
Duke of Brunswick-Lüneburg
Prince of Grubenhagen
Reign 1291–1322
Predecessor none
Successor Henry II
Spouse(s) Agnes of Meissen
Noble family Welf
Father Albert I, Duke of Brunswick-Lüneburg
Mother Adelheid of Montferrat
Born August 1267
Died 7 September 1322(1322-09-07)
Salzderhelden (today part of Einbeck)

Henry I (August 1267 – 7 September 1322), Duke of Brunswick-Lüneburg, called the Admirable (German: Heinrich der Wunderliche, Latin: Henricus Mirabilis), a member of the House of Welf, was the first ruler of the Principality of Grubenhagen from 1291 until his death.


He was the eldest son of the Brunswick duke Albert the Tall and his second wife Adelaide, daughter of Margrave Boniface II of Montferrat. His father had ruled the Duchy of Brunswick-Lüneburg jointly with his brother John, until both divided their territory in 1269. Albert went on to rule the Principality of Wolfenbüttel until his death in 1279.

Henry first ruled the Brunswick principality of Wolfenbüttel jointly with his younger brothers Albert II the Fat and William. In 1291 they again divided the territory; Henry received the part that came to be known as Principality of Grubenhagen. It included the cities of Einbeck, half of Hamelin, Clausthal, Amelungsborn, Duderstadt, Herzberg, and Osterode. Henry quarreled with his brother Albert, who had received the Principality of Göttingen, over the remaining belittled areas around Brunswick and Wolfenbüttel, but Albert prevailed, and Henry retreated to Grubenhagen. He took Einbeck as his residence.

In 1320, Henry was appointed Count Palatine of Saxony by the emperor. He died in 1322, and his three surviving sons who had not joined the Church divided his territory among each other.


Henry married Agnes, daughter of Albert the Degenerate, Margrave of Meissen, in 1282. They had 16 children:



Henry I, Duke of Brunswick-Grubenhagen
Cadet branch of the House of Este
Born: August 1267 Died: 7 September 1322
German nobility
Preceded by
Albert I
Duke of Brunswick-Lüneburg
Princes of Wolfenbüttel
joint reign with Albert II and William I

Succeeded by
William I
Principality of Grubenhagen disentangled from the Principality of Wolfenbüttel Duke of Brunswick and Lüneburg
Prince of Grubenhagen

Succeeded by
Ernest I and Henry II