Question: Who is Robert Iii, Count Of Dreux's paternal grandfather?

Knowledge 1: Robert III, Count of Dreux
Robert III of Dreux (1185–1234), Count of Dreux and Braine, was the son of Robert II, Count of Dreux, and Yolanda de Coucy.He was given the byname Gasteblé (lit. wheat-spoiler) when he destroyed a field of wheat while hunting in his youth.Along with his brother Peter, Duke of Brittany he fought with future Louis VIII of France in 1212 at Nantes and was captured there during a sortie.Exchanged after the Battle of Bouvines for William Longsword, Earl of Salisbury, he fought in the Albigensian Crusade, besieging Avignon in 1226.He was a supporter of Blanche of Castile during her regency after the death of Louis VIII in 1226.In 1210 he married Alianor de St. Valéry (1192–15 Nov 1250) and they had several children: [SEP] Knowledge 2: Robert II, Count of Dreux
Robert II of Dreux (1154 – 28 December 1218), Count of Dreux and Braine, was the eldest surviving son of Robert I, Count of Dreux, and Agnes de Baudemont, countess of Braine, and a grandson of King Louis VI of France.He participated in the Third Crusade, at the Siege of Acre and the Battle of Arsuf.He took part in the war in Normandy against the Angevin Kings between 1193 and 1204.Count Robert had seized the castle of Nonancourt from Richard I of England while he was imprisoned in Germany in late 1193.The count also participated in the Albigensian Crusade in 1210.In 1214 he fought alongside King Philip Augustus at the Battle of Bouvines.
Knowledge 1: Robert III, Count of Dreux
Robert III of Dreux (1185–1234), Count of Dreux and Braine, was the son of Robert II, Count of Dreux, and Yolanda de Coucy.He was given the byname Gasteblé (lit. wheat-spoiler) when he destroyed a field of wheat while hunting in his youth.Along with his brother Peter, Duke of Brittany he fought with future Louis VIII of France in 1212 at Nantes and was captured there during a sortie.Exchanged after the Battle of Bouvines for William Longsword, Earl of Salisbury, he fought in the Albigensian Crusade, besieging Avignon in 1226.He was a supporter of Blanche of Castile during her regency after the death of Louis VIII in 1226.In 1210 he married Alianor de St. Valéry (1192–15 Nov 1250) and they had several children: [SEP] Knowledge 2: Philippa of Dreux
Philippa of Dreux, Dame de Coucy (1192–1242) was a daughter of Robert II of Dreux and his second wife Yolande de Coucy.
Knowledge 1: Robert II, Count of Dreux
Robert II of Dreux (1154 – 28 December 1218), Count of Dreux and Braine, was the eldest surviving son of Robert I, Count of Dreux, and Agnes de Baudemont, countess of Braine, and a grandson of King Louis VI of France.He participated in the Third Crusade, at the Siege of Acre and the Battle of Arsuf.He took part in the war in Normandy against the Angevin Kings between 1193 and 1204.Count Robert had seized the castle of Nonancourt from Richard I of England while he was imprisoned in Germany in late 1193.The count also participated in the Albigensian Crusade in 1210.In 1214 he fought alongside King Philip Augustus at the Battle of Bouvines. [SEP] Knowledge 2: Philippa of Dreux
Philippa of Dreux, Dame de Coucy (1192–1242) was a daughter of Robert II of Dreux and his second wife Yolande de Coucy.

Answer: Robert I, Count of Dreux