Hedwig of Holstein
Hedwig of Holstein or Helvig( 1260 – 1324) was a Swedish queen consort, spouse of King Magnus III of Sweden.
She was the child of Gerhard I, Count of Holstein- Itzehoe( died 1290) and Elisabeth of Mecklenburg( died 1280).
Adolph I, Duke of Cleves
Adolph I of Cleves( 2 August 1373 – 23 September 1448) was the second Count of Cleves and the fourth Count of Mark.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
John I, Duke of Cleves
John I, Duke of Cleves, Count of Mark( 16 February 1419 – 5 September 1481) was Duke of Cleves and Count of Mark.
Arnold II, Count of Looz
Arnold II( or Arnulf, Arnoul)( died 1146), Count of Looz, son of Arnold I, Count of Looz, and Agnes von Mainz, daughter of Gerhard I, Count of Rieneck, and Helwig von Bliescastel.
He is distinguished from his father of the same name by historians who note records for counts named Arnold or Arnulf between 1179 and 1141.
The first Arnold must have died between 1125 when Count Arnold appears in a record with his son also named Arnold, and 1135, when a new Count Arnold appears with his own son and successor Louis.
Between these two dates, in 1129, Gislebert, Count of Duras, sought to seize the property of the Abbey of Sint- Truiden.
( Giselbert was a cousin, the grandson of his namesake Giselbert, Count of Looz.)
A war developed between Giselbert and the supporters of the abbot Radulphe, whose allies included Arnold( possibly Arnold I was still alive), Théoger, Bishop of Metz, Alexander I of Jülich, Bishop of Liege, and Waleran II, Duke of Lower Lorraine.
Gislebert ’s supporters included his brother- in- law Godfrey the Bearded, Count of Louvain, and Thierry of Alsace, Count of Flanders.
The decisive battle took place on August 7, 1129 at Wilderen where Gislebert and his allies were defeated, but peace did not return in 1131.
He founded the Abbey of Averbode, giving home to the Order of Canons Regular of Prémontré that St. Norbert had created.
Arnold had an outstanding reputation among his contemporaries, frequently being the arbiter in disputes between neighbors.
In particular, he succeeded in bringing about a reconciliation between Dirk VI, Count of Holland, and Giselbert ’s son Otto II, to get Herman van Horne, grandson of Emmo, Count of Looz, recognized as Bishop of Utrecht.
He was welcomed with great distinction at the court of the emperors of Germany, and his name frequently appears among the witnesses mentioned in the charters granted by Emperors Henry IV, Henry V and Lothair II, and King of Germany Conrad III.
According to a document which is possibly spurious, Arnold married Aleide.
Arnold is proposed to have had five children:
Arnold was succeeded as Count of Looz by his son Louis.
Gerhard, Count of Mark
Gerhard, Count zur Mark (1378–1461) was the de facto ruler of the County of Mark between 1430 and 1461.
Dietrich was the third son of Count Adolf III of the Marck and Margaret of Jülich.<br
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His father had acquired the County of Cleves in 1368 and given this title to his eldest son Adolf.
The second son Dietrich received the title of Count of Mark.
When Dietrich fell in battle in 1398, he was succeeded as Count of Mark by his elder brother Adolf.
The ambitious Gerhard claimed a part of his father's territories for himself.
In 1423, it came to an armed conflict between Adolf and Gerhard, who had allied himself with the Archbishop of Cologne.
Peace was signed between the two brothers in 1430, and confirmed in 1437.
As a result, Gerhard ruled the largest part of Mark, but was to be succeeded by his nephew John.
Gerhard died in 1461 without children and the County of Mark and Duchy of Cleves were reunited again in a personal union under John I.
Margaret of Jülich
Margaret of Jülich (– 10 October 1425) was a daughter of Duke Gerhard VI of Jülich and his wife, Margaret of Ravensberg (1315-1389).
In 1369, she married Adolf III of the Marck.
She had fourteen children with him, at least five of whom did not survive infancy.
Gerhard I, Count of Holstein-Itzehoe
Gerhard I, Count of Holstein- Itzehoe( 1232 – 21 December 1290) was the only count of Holstein- Itzehoe.
Dietrich IX, Count of Mark
Dietrich IX, Count of Mark( 1374 – 1398) was the Count of Mark from 1393 until 1398.
Dietrich was the second son of Count Adolf III of the Marck and Margaret of Jülich.
His father had acquired the County of Cleves in 1368 and reserved this title for his eldest son Adolph to succeed him after his death.
Dietrich already received the title of Count of Mark in 1393, when his father was still alive.
When Dietrich fell in battle in 1398, he was succeeded by his elder brother Adolph, who had become Count of Cleves in 1394.
Thus the County of Mark and the County of Cleves were reunited again.
Arnold I, Count of Loon
Arnold I( approx 1050- approx 1130), Count of Looz( Loon)( from approx 1079), son of Emmo, Count of Loon, and Suanhildis, daughter of Dirk III, Count of Holland, and his wife Othelandis.
He was an ally of Henry of Verdun and Otbert, both bishops of Liège.
In 1078, he endowed the Collegiate Church of Huy and that of St. John at Liège.
In 1088, he spoke on the request of Bishop Henry of Verdun to end a conflict in the Abbey of St. Truiden where the bishop and emperor Henry IV had both appointed a successor abbot.
As a result of his diplomacy, the emperor transferred the authority of the abbey of Sint- Truiden from Henry I, Duke of Lower Lorraine, to Arnold.
Arnold forced Henry and his ally Godfrey of Bouillon, to withdraw from the monastery.
The domain of Arnold expanded with the County of Rieneck by his marriage to Agnes.
Arnold married Agnes von Mainz, daughter of Gerhard I, Count of Rieneck, and Helwig von Bliescastel.
Sources disagree on their number of children, but are believed to include:
While the confusion about the non-existent" Gerard" remains, Arnold is now understood to have been succeeded by his son Arnold as Count of Looz upon his death.

Question: When did Gerhard, Count Of Mark's mother die?
Answer: 10 October 1425