|Henry I the Admirable|
|Duke of Brunswick-Lüneburg|
|Prince of Grubenhagen|
|Died||7 September 1322|
Salzderhelden (today part of Einbeck)
|Spouse(s)||Agnes of Meissen|
|Father||Albert I, Duke of Brunswick-Lüneburg|
|Mother||Adelheid of Montferrat|
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.
|Ancestors of Henry I, Duke of Brunswick-Grubenhagen|
Henry I, Duke of Brunswick-Grubenhagen
Cadet branch of the House of EsteBorn: August 1267 Died: 7 September 1322
| Duke of Brunswick-Lüneburg
Princes of Wolfenbüttel
joint reign with Albert II and William I
|Principality of Grubenhagen disentangled from the Principality of Wolfenbüttel|| Duke of Brunswick and Lüneburg
Prince of Grubenhagen
Ernest I and Henry II