Matilda II, Countess of Nevers
Matilda II, Countess of Nevers( 1234/35–1262), also known as Maud of Dampierre or Mathilda II of Bourbon, was a sovereign Countess of Nevers, Countess of Auxerre, Countess of Tonnerre and Lady of Bourbon.
She was a daughter of Archambaud IX of Bourbon and Yolande de Châtillon, Countess of Nevers.
As heiress to the counties of Nevers, Auxerre and Tonnerre, she was married off to Odo, Count of Nevers, the son and heir of Hugh IV, Duke of Burgundy.
By this marriage Odo reunited two important areas that had previously been united as the Duchy of Burgundy, but he died leaving no male heirs, and so the united territory passed to his brother Robert II, Duke of Burgundy.
After her father's death Matilda also became Lady of Bourbon.
With Odo she had three children:
Marie d'Albret, Countess of Rethel
Marie d' Albret, Countess of Rethel, Countess of Nevers( 25 March 1491 – 27 October 1549) was the suo jure Countess of Rethel, a title which she inherited at the age of nine upon the death of her mother, Charlotte of Nevers, Sovereign Countess of Rethel, on 23 August 1500.
She was the wife of Charles II of Cleves, Count of Nevers.
Matilda I, Countess of Nevers
Matilda I, Countess of Nevers or Mathilde de Courtenay, or Mahaut de Courtenay,( 1188 – 1257), was a ruling countess of Nevers, Auxerre and Tonnerre.
She was the only daughter of Peter II of Courtenay and of Agnes of Nevers, born from the Capetian House of Courtenay, she was married to Hervé IV of Donzy and then to Guigues IV of Forez.
William IV, Count of Nevers
William IV, Count of Nevers,( c. 1130 – Acre, 24 October 1168) Count of Nevers, Auxerre and Tonnerre( 1161 – 1168).
Francis I, Duke of Nevers
Francis I of Cleves,( 2 September 1516 – 13 February 1561) was a commander in the French Royal Army and the first Duke of Nevers.
He participated in the suppression of the Amboise conspiracy.
The only son of Charles II of Nevers( died in the Louvre in 1521) and Marie d' Albret, Countess of Rethel, Francis succeeded his father as Count of Nevers and Eu. In 1539 he became Duke of Nevers.
When his mother died in 1549, he also inherited the title of Count of Rethel.
In 1538, Francis married Marguerite of Bourbon- La Marche( 1516 – 1589), daughter of Charles de Bourbon, Duke of Vendôme and Françoise of Alençon.
They had five children:
Renauld II, Count of Nevers
Renauld II, Count of Nevers and Auxerre( died 1089) was the son of William I of Nevers, Count of Nevers and Ermengarde of Tonnerre.
He married Ida, daughter of Artald V, Count of Forez.
They had a child: Later he married Agnes of Beaugency.
They had:
Louis I, Count of Nevers
Louis I( 1272 – 22 July 1322) was" suo jure" Count of Nevers and" jure uxoris" Count of Rethel.
Louis was a son of Robert III, Count of Flanders, and Yolande, Countess of Nevers.
He succeeded his parents as Count of Nevers.
In December 1290, he married Joan, Countess of Rethel, and thus became her co-ruler in the County of Rethel.
They had two children:
He died in Paris shortly before his father and thus never succeeded his father as Count of Flanders.
Agnes I, Countess of Nevers
Agnes I (1170 – in 1192 or 1193 in Mailly), Countess of Nevers, Auxerre and Tonnerre (1185-1192), daughter of Guy, Count of Nevers, Auxerre and Tonnerre, and Mathilde de Burgundy, dame of Montpensier.
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:
Guy, Count of Nevers
Guy,(1176), was count of Nevers and Auxerre.
He was the son of William III, Count of Nevers and Ida of Sponheim.
He married Matilda, granddaughter of Duke Hugh II of Burgundy, just prior to his leaving for the "holy land".
Guy died in 1176 and was succeeded by his son, William, whilst his wife Mathilda would be regent of Nevers.

Question: Who is Agnes I, Countess Of Nevers's paternal grandfather?
Answer: William III, Count of Nevers