Tags: Noble.
John I Duke of Brunswick-Grubenhagen (born: before 1322; died: 23 May 1367) was provost of the St. Alexandri Minster in Einbeck.He was the son of Duke Henry I the Marvelous of Brunswick-Grubenhagen and his wife Agnes of Meissen daughter of Margrave Albert II of Meissen.This article incorporates information from the equivalent article on the Deutsch Wikipedia.