Individual Details

Gertrude of Northeim

(1090 - Bet 1154 and 1169)

According to Wikipedia:

Gertrude of Northeim (also Gertrude of Nordheim) (c. 1090 - after 1154/before 1169), was the daughter of Henry, Margrave of Frisia. Gertrude was heiress of Bentheim and Rheineck. She married first Siegfried I of Weimar-Orlamünde and then Otto I, Count of Salm.

Life
Gertrude was born around 1090. She was the daughter of Henry, Margrave of Frisia and Gertrude of Brunswick, daughter of Egbert I of Meissen.[1] Gertrude had two full siblings: Otto III of Northeim, who succeeded her father, and Richenza, who married the future Emperor Lothair II.[2] From her mother’s second marriage, to Henry I, Margrave of the Saxon Ostmark, Gertude also had a half-brother, Henry II, Margrave of Meissen.

First Marriage
Gertrude’s first husband was Siegfried of Ballenstedt. Though marriage to Siegfried, Gertrude was countess palatine of the Rhineland, and countess of Weimar-Orlamünde. Gertrude had three children with Siegfried:[3]

Siegfried II of Weimar-Orlamünde (1107-1124)
Adela of Weimar-Orlamünde, married Conrad I of Peilstein
William of Weimar-Orlamünde (1112-1140)
Second Marriage
After Siegfried’s death in 1113, Gertrude married again. Her second husband was Otto I, Count of Salm, son of the German anti-king Hermann of Salm.[4] Part of the reason Gertrude married Otto was to secure a male protector for her underage sons, Siegfried II and William.[5] With Otto, Gertrude had several children, including:

Otto II (c. 1115 - 1148/1149), fought against Herman of Stahleck to recapture the County Palatine of the Rhine and was taken prisoner in 1148. He was later strangled at Schönburg Castle, near Oberwesel in 1148 or 1149
Sophia, married Dirk VI, Count of Holland (d. 6 August 1157)
Beatrix, married Wilbrand I, Count of Loccum-Hallermund
After the deaths of her son, Otto II, in 1148, and her husband, Otto I, in 1050, Gertrude ruled the county of Bentheim herself, and ensured that her daughter, Sophia, retained possession of Rheineck.[6]

References
O. Engels, Stauferstudien (Jan Thorbecke Verlag Sigmaringen 1996).
L. Fenske, Adelsopposition und kirchliche Reformbewegung im östlichen Sachsen
M. Schaab, Geschichte der Kurpfalz (Kohlhammer Verlag 1988).
R. Hildebrand, Herzog Lothar von Sachsen (Verlag August Lax Hildesheim 1986).
J. Dendorfer, ‘Si(e)gfrid (Graf von Ballenstedt, Pfalzgraf von Lothringen),’ in Neue Deutsche Biographie, vol 24 (Berlin, 2010), ISBN 978-3-428-11205-0, pp. 345f.
A. Thiele, Erzählende genealogische Stammtafeln zur europäischen Geschichte" Band I, Teilband 1 Deutsche Kaiser-, Königs-, Herzogs- und Grafenhäuser I
L. Partenheimer, Albrecht der Bär. Gründer der Mark Brandenburg und des Fürstentums Anhalt
Notes
Thiele, Erzählende genealogische Stammtafeln, table 171.
Fenske, Adelsopposition, p. 343; Engels, Stauferstudien, p. 167.
Dendorfer, 'Si(e)gfrid,' p. 345.
Schaab, Geschichte der Kurpfalz, p. 30.
Hildebrand, Herzog Lothar von Sachsen, pp. 9, 63f.
Hildebrand, Herzog Lothar von Sachsen, p. 63.


-- MERGED NOTE ------------

According to Wikipedia:

Gertrude of Northeim (also Gertrude of Nordheim) (c.?1090 - after 1154/before 1169), was the daughter of Henry, Margrave of Frisia. Gertrude was heiress of Bentheim and Rheineck. She married first Siegfried I of Weimar-Orlamünde and then Otto I, Count of Salm.

Life
Gertrude was born around 1090. She was the daughter of Henry, Margrave of Frisia and Gertrude of Brunswick, daughter of Egbert I of Meissen.[1] Gertrude had two full siblings: Otto III of Northeim, who succeeded her father, and Richenza, who married the future Emperor Lothair II.[2] From her mother`s second marriage, to Henry I, Margrave of the Saxon Ostmark, Gertude also had a half-brother, Henry II, Margrave of Meissen.

First Marriage
Gertrude`s first husband was Siegfried of Ballenstedt. Though marriage to Siegfried, Gertrude was countess palatine of the Rhineland, and countess of Weimar-Orlamünde. Gertrude had three children with Siegfried:[3]

Siegfried II of Weimar-Orlamünde (1107-1124)
Adela of Weimar-Orlamünde, married Conrad I of Peilstein
William of Weimar-Orlamünde (1112-1140)
Second Marriage
After Siegfried`s death in 1113, Gertrude married again. Her second husband was Otto I, Count of Salm, son of the German anti-king Hermann of Salm.[4] Part of the reason Gertrude married Otto was to secure a male protector for her underage sons, Siegfried II and William.[5] With Otto, Gertrude had several children, including:

Otto II (c.?1115 - 1148/1149), fought against Herman of Stahleck to recapture the County Palatine of the Rhine and was taken prisoner in 1148. He was later strangled at Schönburg Castle, near Oberwesel in 1148 or 1149
Sophia, married Dirk VI, Count of Holland (d. 6 August 1157)
Beatrix, married Wilbrand I, Count of Loccum-Hallermund
After the deaths of her son, Otto II, in 1148, and her husband, Otto I, in 1050, Gertrude ruled the county of Bentheim herself, and ensured that her daughter, Sophia, retained possession of Rheineck.[6]

References
O. Engels, Stauferstudien (Jan Thorbecke Verlag Sigmaringen 1996).
L. Fenske, Adelsopposition und kirchliche Reformbewegung im östlichen Sachsen
M. Schaab, Geschichte der Kurpfalz (Kohlhammer Verlag 1988).
R. Hildebrand, Herzog Lothar von Sachsen (Verlag August Lax Hildesheim 1986).
J. Dendorfer, ‘Si(e)gfrid (Graf von Ballenstedt, Pfalzgraf von Lothringen),` in Neue Deutsche Biographie, vol 24 (Berlin, 2010), ISBN 978-3-428-11205-0, pp. 345f.
A. Thiele, Erzählende genealogische Stammtafeln zur europäischen Geschichte" Band I, Teilband 1 Deutsche Kaiser-, Königs-, Herzogs- und Grafenhäuser I
L. Partenheimer, Albrecht der Bär. Gründer der Mark Brandenburg und des Fürstentums Anhalt
Notes
Thiele, Erzählende genealogische Stammtafeln, table 171.
Fenske, Adelsopposition, p. 343; Engels, Stauferstudien, p. 167.
Dendorfer, 'Si(e)gfrid,' p. 345.
Schaab, Geschichte der Kurpfalz, p. 30.
Hildebrand, Herzog Lothar von Sachsen, pp. 9, 63f.
Hildebrand, Herzog Lothar von Sachsen, p. 63.

Events

Birth1090
Marriage1115Otto I, Count of Salm
DeathBet 1154 and 1169

Families

SpouseSiegfried of Ballenstedt (1075 - 1113)
SpouseOtto I, Count of Salm (1080 - 1150)
ChildSophia of Rheineck (1120 - 1176)
FatherHenry, Margrave of Frisia (1055 - 1101)
MotherGertrude of Brunswick (1060 - 1117)
SiblingRichenza of Northeim (1087 - 1141)