"Philip I, Duke of Brunswick-Grubenhagen (German: Philipp I., Herzog von Braunschweig-Grubenhagen; 1476 – 4 September 1551, Herzberg) was a member of the House of Guelph. He ...
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was ruler of the Principality of Grubenhagen. He was the second son of Duke Albert II of Grubenhagen and his wife Elizabeth, née Countess of Waldeck. Philip was the last member of the Grubenhagen line to use the title Duke of Brunswick. His successors used the title Duke of Brunswick and Lüneburg, like most other princes of the House of Guelph.
After his father´s death in 1485, he was first under the guardianship of his cousin Henry IV and his mother Elisabeth. As early as 1486 he signed deeds himself. In 1494, he took up the government of his principality. His seat, Herzberg Castle, was completely destroyed in a fire in 1510. His cousin Henry died childless in 1526 and Philip inherited Henry´s part of the principality, thereby reuniting all of Grubenhagen under a single Duke for the first time since 1479." - (en.wikipedia.org 27.10.2020)
