Catherine of Guelders
Catherine of Guelders( ca. 1440 – Guelders, January 25, 1497), was regent of the Duchy of Guelders between 1477 and 1492.
Catherine of Guelders was the fourth and youngest child of Arnold, Duke of Guelders( 1410- 1473) and Catherine of Cleves( 1417 – 1479).< br>
Until 1477, she led an inconspicuous life, in the shadow of her brother Adolf, at war with his father, and her sisters Mary, married to King James II of Scotland and Margaret, married to Frederick I, Count Palatine of Simmern .<br>
Despite efforts by her father, no suitable husband was found for Catherine .< br> 17th century theories that she was secretly married with Louis de Bourbon, Bishop of Liège, are now believed to be false.
Everything changed for Catherine in 1477, when Charles the Bold was killed in the Battle of Nancy.
Guelders had been under control of Charles the Bold since 1473, and now saw the chance to regain its independence.
As her brother Adolf was in Flanders, the States of Guelders convinced him to appoint his sister Catherine as regent, pending his return.
Catherine reluctantly agreed.
But the regency lasted much longer than expected because Adolf was killed in battle on June 27, 1477.
She then continued to rule as regent for his son Charles II, who was held with his sister Philippa by the Burgundians.
Catherine became involved in the Guelderian War of Independence with Maximilian of Austria.
In 1482, she was forced to conclude peace with Maximilian and to retire from politics.
In 1492, she witnessed the regained independence of Guelders under her nephew Charles II, Duke of Guelders .< br>
Catherine died in 1497 and was buried in the church of Geldern, where her grave can still be seen.
Otto I, Count of Guelders
Otto I of Guelders( 1150 – 1207) was a Count of Guelders and Zutphen from 1182 until his death in 1207.
He was a son of Duke Hendrik of Guelders and Agnes of Arnstein.
He married Richardis of Bavaria in 1184.
Richardis was a daughter of Otto I Wittelsbach, Duke of Bavaria.
Maria, Duchess of Guelders
Marie of Guelders( † May 12, 1405) was one of two pretenders to the title of Duchess of Guelders and Countess of Zutphen on behalf of her son during the War of the Guelderian Succession from 1371 to 1379.
The war began after the deaths of her brothers, Reginald III of Guelders and Edward of Guelders.
Edward died from wounds received at the Battle of Baesweiler, and Reginald, who was known as the fat, died months later.
Succession was also claimed by Marie's sister, Mathilda, whose side was called the" Heeckerens" and were led by Frederik van Heeckeren van der Eze( 1320- 1386).
Her party was called the" Bronckhorsters" and was led by Gijsbert V van Bronckhorst( 1328- 1356).
Upon victory of her party, the title of Duke of Guelders went to her son, William.
Marie was daughter of Reginald II, Duke of Guelders and Sophie Berthout, lady of Malines.
On December 25, 1362, she married William II, Duke of Jülich( † 1393).
They had three children:
John II, Count of Blois
John II of Châtillon( died 1381, in Valenciennes), second son of Louis I of Châtillon and Jeanne of Avesnes, was count of Blois and lord of Avesnes from 1372 to 1381.
In February 1372, he married Mathilde of Guelders( d. 1384), the daughter and co-heir of Duke Reginald II of Guelders, and became Lord of Schoonhoven and Gouda.
He spent most of his career trying to seize Guelders from Mathilde's nephew William I of Guelders and Jülich.
Reginald II, Duke of Guelders
Reginald II of Guelders , called "the Black" (c. 1295 – 12 October 1343), was Count of Guelders, and from 1339 onwards Duke of Guelders, and Zutphen, in the Low Countries, from 1326 to 1343.
He was the son of Reginald I of Guelders and Marguerite of Flanders.
Reginald I of Guelders
Reginald I of Guelders (1255 – Monfort, October 9, 1326) was Count of Guelders from January 10, 1271 until his death.
He was the son of Otto II, Count of Guelders and Philippe of Dammartin.<br
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In 1276 he married Irmgard of Limburg, only daughter and heiress of Waleran IV, Duke of Limburg.
In 1279 he became Duke of Limburg and when Irmgard died childless in 1283, he became the only ruler of the Duchy of Limburg.
He lost this title after losing the Battle of Woeringen in 1288.
In 1286 he remarried Margaret of Flanders (1272–1331), daughter of Guy, Count of Flanders from his second marriage, with Isabelle of Luxembourg.
They had 5 children:
Financially ruined after the Battle of Woeringen, Guelders came under the influence of his father-in-law, the Count of Flanders.<br> From 1318, he was replaced by his son, who imprisoned his father in 1320 in the Montfort Castle.
Reginald I died here 6 years later.
Catherine of Cleves (1417–1479)
Catherine of Cleves (25 May 1417 – 10 February 1479) was Duchess of Guelders by marriage to Arnold, Duke of Guelders.
She acted as regent of Guelders during the absence of her spouse in 1450.
The Hours of Catherine of Cleves was commissioned for her.
Johann, Count of Cleves
Johann was last Count of Cleves, from 1347 through 1368.
Upon his death in 1368, the counties of Cleves and Count of Mark were united.
Johann was the youngest son of Dietrich VII, Count of Cleves and his second wife Margaret of Habsburg.
He succeeded in 1347 his brother Dietrich VIII, Count of Cleves who had died without sons.
He married Mechteld of Guelders( † 1384), daughter of Reginald II, Duke of Guelders, but the marriage remained childless.
After his death, the County of Cleves went to Adolf III of the Marck and so to the Counts of Marck.
Eleanor of Woodstock
Eleanor of Woodstock( 18 June 1318 – 22 April 1355) was an English princess and Duchess consort of Guelders by marriage.
She was regent of Guelders as the guardian of her minor son from 1343 until 1344.
Eleanor was born at Woodstock Palace in Oxfordshire to King Edward II of England and his queen Isabella of France.
She was a younger sister of Edward III of England and the second wife of Reginald II of Guelders," the Black".
Eleanor's maternal grandfather was King Philip the Fair of France.
Reginald III, Duke of Guelders
Reginald III of Guelders( or" Renaud", known as" The Fat")( 13 May 1333 – 4 December 1371) was Duke of Guelders and Count of Zutphen from 1343 to 1361, and again in 1371.
He was the son of Reginald II of Guelders and of Eleanor of Woodstock, daughter of Edward II of England.
With the death of his father in 1343, his mother held the regency until 1344.
From 1350, his brother Edward asserted his rights and a quarrel of succession broke out between the two brothers until 1361.
Reginald was overcome in Tiel and was imprisoned in the castle of Nijenbeek.
There he became so large that he could not have left, even if the door had remained open—hence his appellation" The Fat".
Edward died on 24 August 1371, having been mortally wounded in the Battle of Baesweiler, and Reginald was released( according to the legend, the walls had to be cut away so he could leave); he held the ducal throne for only a short period, dying a few months later.
He was buried at Graefenthal Abbey.
As he did not have a legitimate child, the succession passed to his sisters: Mathilde( also, Machteld), who was married to John II, Count of Blois, and Maria, wife of William II of Jülich and mother to William I of Guelders and Jülich, on whose behalf she claimed the throne of Guelders.
The sisters and their respective followers( the" Heeckerens", from the party led by families of Van Heeckeren and their relatives, the Van Rechterens, supported Mathilde, while the faction known as the" Bronkhorsters" followed Maria) fought for the duchy of Guelders in the War of the Succession of Guelders.

Question: Who is the paternal grandfather of Reginald Ii, Duke Of Guelders?
Answer: Otto II, Count of Guelders