He was preparing to leave Brunswick with his father-in-law for the purpose of being present at this assembly when Otto was suddenly taken unwell and expired on 9 June.
Brunswick Cathedral
He is married to Mathilde "Matilda" von Brandenburg.
They got married in the year 1228 at Schoningen, Brunswick, Thueringen, Holy Roman Empire (now Germany), he was 23 years old.Source 1
Child(ren):
Otto I "The Child" von Braunschweig-Lüneburg | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1228 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Mathilde "Matilda" von Brandenburg |