Richenza of Northeim was a member of the dynasty of the Counts of Northeim, and a German Empress.

She was the daughter of Henry the Fat of Northeim (d. 1101) and Gertrud of Brunswick

Gertrud of Brunswick

Gertrud of Brunswick was a member of the Brunonen dynasty and the Margravine of Meissen.Gertrude was the daughter of Egbert I, Margrave of Meissen, and Irmgard of Susa. She was married to Count Dietrich II of Katlenburg . In 1090, after the childless death of her older brother Ekbert, last of the...

 of the Brunonen dynasty.

Around 1100 Richenza married Lothar von Süpplingenburg

Lothair III, Holy Roman Emperor

Lothair III of Supplinburg , was Duke of Saxony , King of Germany , and Holy Roman Emperor from 1133 to 1137. The son of Count Gebhard of Supplinburg, his reign was troubled by the constant intriguing of Frederick I, Duke of Swabia and Duke Conrad of Franconia...

, Duke of Saxony and future Holy Roman Emperor. Their daughter, Gertrud of Süpplingenburg

Gertrud of Süpplingenburg

Gertrud of Süpplingenburg was the only child of Emperor Lothar III , Duke of Saxony, and his wife Richenza of Northeim....

 was born in 1115; she later married Henry the Proud

Henry X, Duke of Bavaria

thumb|right|Henry X in a much later engraving.Henry the Proud was the Duke of Bavaria , Duke of Saxony , and Margrave of Tuscany .-Life and reign:...

, Duke of Bavaria (d. 1139). This act brought both the Northeim

Northeim

Northeim is a city in Lower Saxony, Germany, seat of the district of Northeim, with, as of 2002, a population of 31 000. It's located on the German Half-Timbered House Road.-History:...

 and Brunonen lands into the hands of the Welf dynasty. Richenza died on 10 June 1141.