Heinrich (der Fette) von Northeim Markgraf in Friesland ¹⁶⁷

  Notater:

Henry the Fat (c.1055 - 1101), also known as Henry of Nordheim or Northeim, was from 1083 Count in Rittigau and Eichsfeld and from 1099 the Margrave of Frisia. He was the eldest son of Otto of Nordheim and Richenza of Swabia.

He was, by his patrimony of Rittigau and Eichsfeld, one of the most influential Saxon princes of his age. In 1086 he married the widow Gertrude of Brunswick and united the lands of the Counts of Katlenburg and the Brunonen to the Nordheimer Länderei. From the counts of Bilstein he inherited parts of the Werra Valley, where he became the sole landholder. Further, he was the Vogt of Helmarshausen and founded a Benedictine monastery at Bursfelde in 1093.

During the civil wars of the early 1080s Henry sided with the anti-king Herman of Salm, to whom he was related by marriage. In 1086 he and his brothers changed sides to support the Emperor Henry IV.

Heinrich blev gift med Gertrude von Braunschweig, datter af Egbert I Graf von Braunschweig og Irmingard de Susa, omkring 1086. (Gertrude von Braunschweig blev født omkring 1060 i Braunschweig, , Niedersachsen, Germany og døde den 9 Dec. 1117.)