Question: Who is the paternal grandfather of Louis Iii, Count Of Blois?

Knowledge 1: Louis III, Count of Blois
Louis III of Châtillon (died 1372), son of Louis II, Count of Blois and Jeanne of Hainault, was count of Blois and lord of Avesnes 1346–1372, and count of Soissons 1346–1367.After the Battle of Poitiers, he had to send his brother Guy as a hostage to London, and ultimately sold Soissons to Enguerrand VII de Coucy to ransom him. [SEP] Knowledge 2: Louis II, Count of Blois
Louis II of Châtillon (d. 26 August 1346, battle of Crécy), son of Guy I, Count of Blois and Margaret of Valois, was count of Blois and lord of Avesnes 1342–1346.In 1340 in Soissons, he married Jeanne of Avesnes, Countess of Soissons (d. 1350), daughter of John of Avesnes, Lord of Beaumont.They had three children:Louis was killed at the Battle of Crécy.
Knowledge 1: Louis III, Count of Blois
Louis III of Châtillon (died 1372), son of Louis II, Count of Blois and Jeanne of Hainault, was count of Blois and lord of Avesnes 1346–1372, and count of Soissons 1346–1367.After the Battle of Poitiers, he had to send his brother Guy as a hostage to London, and ultimately sold Soissons to Enguerrand VII de Coucy to ransom him. [SEP] Knowledge 2: Hugh I, Count of Blois
Hugh I, Count of Blois, also known as" Hugh I of Châtillon"( c.1198 – 9 April 1248) was Count of Blois from 1230 to 1241, and Count of Saint Pol( as Hugh V) from 1226 to 1248.Hugh was son of Gaucher III of Châtillon and Elisabeth( 1180 – 1212), daughter of Hugo IV, Count of Saint- Pol.He married Agnes of Bar- le- Duc, daughter of Thibaut I of Bar- le- Duc and Hermesend of Bar-sur- Seine, in 1216.By 1225, Agnes was dead and Hugh married Marie.In 1226, Hugh married Marie of Avesnes, daughter of Walter II of Avesnes and Margaret of Blois.They had 5 children:Through his marriage Hugh became the first count of Blois from the house of Châtillon.It marked the end of the first dynasty of Blois that lasted over 400 years.After the death of Marie, Hugh married Mahaut, sister of Baldwin III, Count of Guînes.In 1226 the Cisterian nunnery Pont-aux- Dames in Couilly was founded by Hugh.Later Hugh, with the assistance of Philip Mécringes, founded a Cistercian nunnery at Troissy called" L'Amour- Dieu" in 1232.Hugh intended to follow the pious king Louis IX when he started on the Seventh Crusade, but he died in 1248.
Knowledge 1: Louis II, Count of Blois
Louis II of Châtillon (d. 26 August 1346, battle of Crécy), son of Guy I, Count of Blois and Margaret of Valois, was count of Blois and lord of Avesnes 1342–1346.In 1340 in Soissons, he married Jeanne of Avesnes, Countess of Soissons (d. 1350), daughter of John of Avesnes, Lord of Beaumont.They had three children:Louis was killed at the Battle of Crécy. [SEP] Knowledge 2: Hugh I, Count of Blois
Hugh I, Count of Blois, also known as" Hugh I of Châtillon"( c.1198 – 9 April 1248) was Count of Blois from 1230 to 1241, and Count of Saint Pol( as Hugh V) from 1226 to 1248.Hugh was son of Gaucher III of Châtillon and Elisabeth( 1180 – 1212), daughter of Hugo IV, Count of Saint- Pol.He married Agnes of Bar- le- Duc, daughter of Thibaut I of Bar- le- Duc and Hermesend of Bar-sur- Seine, in 1216.By 1225, Agnes was dead and Hugh married Marie.In 1226, Hugh married Marie of Avesnes, daughter of Walter II of Avesnes and Margaret of Blois.They had 5 children:Through his marriage Hugh became the first count of Blois from the house of Châtillon.It marked the end of the first dynasty of Blois that lasted over 400 years.After the death of Marie, Hugh married Mahaut, sister of Baldwin III, Count of Guînes.In 1226 the Cisterian nunnery Pont-aux- Dames in Couilly was founded by Hugh.Later Hugh, with the assistance of Philip Mécringes, founded a Cistercian nunnery at Troissy called" L'Amour- Dieu" in 1232.Hugh intended to follow the pious king Louis IX when he started on the Seventh Crusade, but he died in 1248.

Answer: Guy I, Count of Blois