Question: When did Engelbert, Count Of Nevers's mother die?

Knowledge 1: Engelbert, Count of Nevers
Engelbert of Cleves, Count of Nevers (26 September 1462 – 21 November 1506) was the younger son of John I, Duke of Cleves and Elizabeth of Nevers, only surviving child of John II, Count of Nevers.In 1481, he was sent with a large army to the Bishopric of Utrecht by his brother John II, Duke of Cleves where they successfully ousted David of Burgundy.But after the Siege of Utrecht (1483) he had to flee, and Utrecht returned to the control of Burgundy.He married Charlotte of Bourbon-Vendôme, daughter of John VIII, Count of Vendôme, circa 1489.Their son
Engelbert became Count of Nevers and Eu in 1491 upon the death of his maternal grandfather John II, Count of Nevers.His eldest brother John II (1458–1521) inherited Cleves. [SEP] Knowledge 2: Elizabeth of Nevers
Elizabeth of Nevers (born: after 24 August 1439 in Nevers; died: 21 June 1483) was Duchess of Cleves from 1455 until her death, due to her marriage with John I of Cleves-Mark.She was the matriarch of the house of Cleves-Nevers, and thus the Cleves line of the Counts and dukes of Nevers.Because the territory was part of her inheritance, it fell to her son Engelbert after her death.
Knowledge 1: Engelbert, Count of Nevers
Engelbert of Cleves, Count of Nevers (26 September 1462 – 21 November 1506) was the younger son of John I, Duke of Cleves and Elizabeth of Nevers, only surviving child of John II, Count of Nevers.In 1481, he was sent with a large army to the Bishopric of Utrecht by his brother John II, Duke of Cleves where they successfully ousted David of Burgundy.But after the Siege of Utrecht (1483) he had to flee, and Utrecht returned to the control of Burgundy.He married Charlotte of Bourbon-Vendôme, daughter of John VIII, Count of Vendôme, circa 1489.Their son
Engelbert became Count of Nevers and Eu in 1491 upon the death of his maternal grandfather John II, Count of Nevers.His eldest brother John II (1458–1521) inherited Cleves. [SEP] Knowledge 2: John II, Count of Nevers
John II, Count of Nevers( known as Jean de Clamecy, prior to acquiring title of" Count of Nevers"; 1415–1491) was a French noble.
Knowledge 1: Engelbert, Count of Nevers
Engelbert of Cleves, Count of Nevers (26 September 1462 – 21 November 1506) was the younger son of John I, Duke of Cleves and Elizabeth of Nevers, only surviving child of John II, Count of Nevers.In 1481, he was sent with a large army to the Bishopric of Utrecht by his brother John II, Duke of Cleves where they successfully ousted David of Burgundy.But after the Siege of Utrecht (1483) he had to flee, and Utrecht returned to the control of Burgundy.He married Charlotte of Bourbon-Vendôme, daughter of John VIII, Count of Vendôme, circa 1489.Their son
Engelbert became Count of Nevers and Eu in 1491 upon the death of his maternal grandfather John II, Count of Nevers.His eldest brother John II (1458–1521) inherited Cleves. [SEP] Knowledge 2: Charles II, Count of Nevers
Charles II( died in Louvre in 1521) was Count of Nevers( 1506 – 1521).He was son of Engelbert de La Mark and Charlotte de Bourbon- Vendome.He belongs to the House de La Mark.His father Engelbert, Count of Nevers( 1491 – 1506) was son of John I, Duke of Cleves( 1384 – 1404) and Elisabeth Countess of Nevers.Elisabeth was great- granddaughter of Philip II duke of Burgundy.Charles II succeeded his father in 1506.He married in 1504 to Marie d' Albret, Countess of Rethel, daughter of Jean d' Albret and Charlotte Countess of Rethel.Thus he became Count of Rethel jure uxoris.They had:

Answer: 21 June 1483