John, Count of Saint-Pol
John of Saint- Pol( died 1344) was Count of Saint- Pol between 1317 and 1344.
He was the eldest son of Guy IV, Count of Saint- Pol and Marie of Brittany.
He married in 1319 with Joanna, daughter of John I of Fiennes, and had 2 children:
Catherine of Luxembourg-Saint-Pol
Catherine of Luxembourg-Saint-Pol (died 1492), was a Duchess consort of Brittany, married to Arthur III, Duke of Brittany.
She was a daughter of Peter of Luxembourg, Count of Saint-Pol and Margherita del Balzo.
Catherine’s marriage to Arthur III took place on 2 July 1445.
In December 1445 she went to Nantes, where her husband organized wedding celebrations in her honor.
Then she lived in Parthenay and travelled only in 1457 with her husband again to Brittany, because his nephew, the duke Peter II, had fallen ill.
After Peter’s death (22 September 1457)
Arthur III became new Duke and therefore his wife Catherine briefly Duchess consort of Brittany, but Arthur already died on 26 December 1458 at Nantes at the age of 65 years.
His marriage with Catherine had remained childless.
Catherine lived as widow a secluded life, probably died in March 1492 and was buried in the Carthusian monastery of Nantes, which she had finished.
Beatrice of Luxembourg
Beatrice of Luxembourg( 1305 – 11 November 1319), was by birth member of the House of Luxembourg and by marriage Queen of Hungary.
She was the youngest child of Henry VII, Holy Roman Emperor and his wife, Margaret of Brabant.
Her two siblings were John of Luxembourg and Marie of Luxembourg, Queen of France.
Marie of Luxembourg, Countess of Vendôme
Marie of Luxembourg( died 1 April 1547) was a French princess, the elder daughter and principal heiress of Peter II of Luxembourg, Count of Saint- Pol and Soissons, and Margaret of Savoy, a daughter of Louis I, Duke of Savoy.
She belonged to the French, cadet branch of a dynasty which had reigned as Dukes of Luxembourg, and whose senior line provided several Holy Roman Emperors, before becoming extinct in 1437.
Her paternal grandparents were Louis of Luxembourg, Count of Saint- Pol and Brienne and Jeanne de Bar, Countess of Marle and Soissons.
Her maternal grandparents were Louis I, Duke of Savoy and Princess Anne of Cyprus.
Guy V, Count of Saint-Pol
Guy V of Châtillon, Count of Saint- Pol( d. 1360 in London) was a French nobleman.
He was a member of the House of Châtillon and was the son of Count John of Saint- Pol( d. 1344) and his wife Johanna of Fiennes.
In the Hundred Years' War, he served as a royal commander in the French army.
He fought several battles against the English in Picardy.
He was one of the hostages sent to England under the terms of the Treaty of Brétigny of 1360.
He died of the plague shortly after arriving in London.
Guy was married to Johanna( d. 1392), a daughter of Lord John I of Ligny.
Since they had no children, he was succeeded as Count of Saint- Pol by his sister Mahaut and her husband Guy of Luxembourg- Ligny.
Peter I, Count of Saint-Pol
Peter of Luxembourg (1390 – 31 August 1433) was a son of John of Luxembourg, Lord of Beauvoir, and his wife Marguerite of Enghien.
His inheritance included the counties of Brienne, Conversano and Saint-Pol.
Waleran III, Count of Ligny
Waleran III of Luxembourg( 1355 – 12 April 1415) Count of Ligny and Saint Pol, was a French nobleman and soldier.
Joan, Countess of Ligny
Joan, Countess of Saint- Pol and Ligny( d. 18 September 1430, Avignon), called the Demoiselle de Luxembourg, was the daughter of Guy of Luxembourg, Count of Ligny and Mahaut of Châtillon, Countess of Saint- Pol.
At the death of Philip I, Duke of Brabant, she was his nearest living relative on the Saint- Pol side and inherited Saint- Pol and Ligny upon his death on 14 August 1430.
She was living at the time at Beaurevoir, which belonged to her favourite nephew John.
At this time, John held Joan of Arc, whom he had captured, as a prisoner.
The Demoiselle de Luxembourg showed kindness to her and pleaded with her nephew not to sell Joan to the English.
The Demoiselle died shortly thereafter; her fiefs were divided between her senior nephew, the Count of Brienne, who received Saint- Pol, and John, her favourite, who received Ligny.
The Demoiselle is a character in Philippa Gregory's 2011 historical novel" The Lady of the Rivers", which centres on her great- niece Jacquetta of Luxembourg.
Hugh IV, Count of Saint-Pol
Hugh IV of Saint- Pol( died March 1205 in Constantinople) from the House of Campdavaine, son of Anselm of Saint- Pol, was Count of Saint- Pol from 1174 to his death, and lord of Demotika( Didymoteicho) in Thrace in 1204 – 05.
He participated in the Third and Fourth Crusades.
Sir Thomas Green
Sir Thomas Green( c.1461 – 9 November 1506) was a member of the English gentry who died in the Tower of London, where he had been imprisoned for treason.
He is best known as the grandfather of Catherine Parr, last wife of King Henry VIII.

Question: Who is Catherine Of Luxembourg-Saint-Pol's paternal grandfather?