Esico of Ballenstedt
Esico of Ballenstedt( died around 1060) is the progenitor of the House of Ascania,( i.e., the oldest known member of his dynasty).
Esico was the count of Ballenstedt( r.1036-1060), and his possessions became the nucleus of the later Principality of Anhalt.
Siegfried of Ballenstedt
Siegfried I of Ballenstedt( – 9 March 1113), was the son of Adalbert II of Ballenstedt, and a member of the House of Ascania.
He was count palatine of the Rhineland( r.1095/7-1113), and count of Weimar- Orlamünde( r.1112-1113).
Eilika of Saxony
Eilika of Saxony( – 16 January 1142) was a daughter of Magnus, Duke of Saxony and a member of the Billung dynasty.
Through marriage to Otto of Ballenstedt, she was countess of Ballenstedt.
Otto IV, Count of Scheyern
Otto V, Count of Wittelsbach (– 4 August 1156), also called Otto IV, Count of Scheyern, was the second son of Eckhard I, Count of Scheyern.
Otto named himself "Otto of Wittelsbach", after Wittelsbach Castle near Aichach.
He served Henry V, Holy Roman Emperor, in his first Italian Expedition in 1110–1111.
Emperor Henry V already addressed him as Otto Count of "Witlinesbac" in a document in 1115.
From 1120 onwards, he was Count palatine of Bavaria.
Otto, Count of Ballenstedt
Otto, Count of Ballenstedt, called Otto the Rich (– 9 February 1123), was the first Ascanian prince to call himself count of Anhalt, and was also briefly named duke of Saxony.
He was the father of Albert the Bear, who later conquered Brandenburg from the Slavs and called himself its first margrave.
Otto was the eldest son of Adalbert II, Count of Ballenstedt and Adelaide of Weimar-Orlamünde, daughter of Otto I, Margrave of Meissen.
After the death of his father-in-law, Magnus, Duke of Saxony, in 1106, Otto inherited a significant part of Magnus' properties, and hoped to succeed him as duke.
However, Lothar of Supplinburg was named duke in his stead.
In 1112, after Lothar had been banned, Otto was appointed duke of Saxony by Emperor Henry V; but in the same year, he came into a dispute with the emperor and was stripped of his ducal title.
He now allied himself with Lothar, and helped Lothar defeat Hoyer I, Count of Mansfeld, who had been named duke of Saxony by the Emperor, in 1115.
Otto conquered the areas around Zerbst and Salzwedel from Slavs, and maintained Lothar's support once Lothar became king in 1125.
He also claimed the County of Weimar-Orlamünde, of which his mother was the heir.
Adelaide of Ballenstedt
Adelaide of Ballenstedt( after 1139) was the daughter of Otto of Ballenstedt and a member of the House of Ascania.
She married, successively, Henry IV, Count of Stade, and Werner, Count of Osterburg.
Odo I of Furneaux
Odo l of Furneaux( Eudes de Furneaux)( 1040- 1086) was a Frankish noble from Herbertien dynasty a branch of Carolingian dynasty.
He was Count of Furneaux, son of Otto, Count of Vermandois and his wife Pavia( or Patia).
He was married to Bertha, whose family and relatives remain unknown.
Adelaide of Weimar-Orlamünde
Adelaide of Weimar-Orlamünde (28 March 1100) was the daughter of Otto I of Meissen and a member of the family of the counts of Weimar and Orlamünde.
She married successively, Adalbert II of Ballenstedt, count palatine Herman II, and Henry of Laach.
Otto, Count of Lippe-Brake
Otto, Count of Lippe- Brake( 21 December 1589 – 18 November 1657 in Blomberg) was the first ruling Count of Lippe- Brake.
Henry II, Margrave of the Nordmark
Henry II( 1102 – 4 December 1128), Margrave of the Nordmark, also Count of Stade( as Henry IV), son of Lothair Udo III, Margrave of the Nordmark, and Irmgard, daughter of Dietrich, Count of Plötzkau, and Mathilde von Walbeck.
Henry assumed the title of Margrave of the Nordmark in 1114 from Helperich of Plötzkau, who was appointed margrave until Henry came of age.
The previous margrave in this dynasty was Henry ’s uncle Rudolf I, who was also his guardian.
Rudolf was deposed by Emperor Henry V because of conspiracy against the crown, and was replaced by Helperich as an interim measure.
Henry assumed the titles of Count of Stade and Margrave of the Nordmark in 1114.
Henry was married to Adelaide of Ballenstedt, a daughter of Otto, Count of Ballenstedt, and Eilika of Saxony.
Adelaide was therefore the sister of Albert the Bear.
There are no known children as a result of this union.
Henry was succeeded as margrave by the son of Helperich, Conrad of Plötzkau.

Question: When did Otto, Count Of Ballenstedt's mother die?