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.
Thuringbert, Count of Hesbaye
Thuringbert (735–770), Count of Hesbaye and Count of Wormsgau, son of Robert I, Count of Hesbaye, and Williswinda.
Thuringbert and his wife (name unknown) had one child:
Thuringbert was succeeded as Count of Hesbaye by his son Robert.
Robert V, Count of Dreux
Robert V of Dreux( – 22 March 1329), Count of Dreux and Braine, was the eldest son of John II of Dreux.
His mother was Peronelle de Sully, the principal lady of Joan II, Countess of Burgundy's household.
Robert was a supporter of Joan II's husband, Philip V of France.
He succeeded his father as Count of Dreux in 1309 and reigned until his death in 1329.
He married Marie d' Enghien in April 1321, but died without issue on 22 March 1329 in Braine and was succeeded by his brother, John III of Dreux.
Robert I, Count of Dreux
Robert I of Dreux, nicknamed "the Great" (– 11 October 1188), was the fifth son of Louis VI of France and Adélaide de Maurienne.
Through his mother he was related to the Carolingians and to the Marquess William V of Montferrat.
In 1137 he received the County of Dreux as an appanage from his father.
He held this title until 1184 when he granted it to his son Robert II.
In 1139 he married Agnes de Garlande.
In 1145, he married Hawise of Salisbury, becoming count of Perche, as regent to his stepson Rotrou IV.
By his third marriage to Agnes de Baudemont in 1152, he received the County of Braine-sur-Vesle, and the lordships of Fère-en-Tardenois, Pontarcy, Nesle, Longueville, Quincy-en-Tardenois, Savigny, and Baudemont.
Robert I participated in the Second Crusade and was at the Siege of Damascus in 1148.
In 1158 he fought against the English and participated in the Siege of Séez in 1154.
Louis VI of France
Louis VI (late 1081 – 1 August 1137), called the Fat  or the Fighter , was King of France from 1108 to 1137.
Louis was a warrior-king, but by his forties his weight had become so great that it was increasingly difficult for him to lead in the field.
A biography"The Deeds of Louis the Fat", prepared by his loyal advisor Abbot Suger of Saint Denisoffers a fully developed portrait of his character, in contrast to what little historians know about most of his predecessors.
Peter, Count of Dreux
Peter,( 1298 – 3 November 1345), Count of Dreux, was the youngest son of John II, Count of Dreux and Jeanne of Beaujeu.
He participated in the war of Philip VI of France, fighting against the Flemish who were revolting against their count, and he fought at the Battle of Cassel in 1328.
John I, Count of Dreux
John I of Dreux( 1215–1249), Count of Dreux and Braine, was the son of Robert III of Dreux and Annora( Aenor) of Saint- Valéry.
John III, Count of Dreux
John III( – 1331), Count of Dreux, was the second son of John II of Dreux and of Jeanne of Beaujeu.
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.
Adèle of Dreux
Adèle of Dreux( 1145 – aft. 1210) was a member of Norman French nobility, daughter of Robert I, Count of Dreux and his second wife Hawise of Salisbury.
She married Valéran III, Count of Breteuil on 24 June 1156, and had the following issue:
After Valéran's death in 1162, she married secondly Guy II of Châtillon and had:
She married thirdly John I de Thorotte and had:
Her final marriage was to Ralph, Count of Soissons, with whom she had: Adèle died after 1210.

Question: When did Robert I, Count Of Dreux's father die?
Answer: 1 August 1137