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.
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.
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 II, Count of Dreux
John II of Dreux( 1265 – 1309), called John the Good, Count of Dreux and Braine, was the son of Robert IV of Dreux and Beatrice, Countess of Montfort.
Robert fought with Philip IV of France in his wars in Flanders, including the sieges of Veurne, Cassel, de Bergues and Lille in 1297.
He was at the Battle of the Golden Spurs( fought near Cambrai), where the French forces under Robert II of Artois suffered an unexpected defeat.
In 1304, he fought at the Battle of Mons- en- Pévèle and served at the siege of Lille.
He was chosen as one of the French ambassadors who negotiated an end to the war.
His first marriage to Jeanne of Montpensier(? – 1308) produced four sons and a daughter.
Three of the sons, Robert, John and Peter were successively Counts of Dreux.
His second marriage to Perrenelle of Sully in 1308 produced one child, Joan, the last Capetian ruler of the county.
Joan I, Countess of Dreux
Joan I (1345–1346), Countess of Dreux, was the only child of Peter, Count of Dreux and Isabeau de Melun, lady of Houdain.
Her father died when she was not yet a year old, but she barely survived him, dying less than a year into her reign.
Her aunt, Joan, succeeded her.
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.
Beatrice, Countess of Montfort
Beatrice de Montfort, Countess of Montfort -l' Amaury( c. December 1248 /1249 – 9 March 1312) was a ruling sovereign countess of Montfort from 1249 until 1312.
She was also countess of Dreux by marriage to Robert IV of Dreux, Count of Dreux.
She was the ancestor of the Dukes of Brittany from the House of Montfort- Dreux which derived its name from her title.
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.
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.
Joan II, Countess of Dreux
Joan II( 1309 – 1355), Countess of Dreux, was the only child of John II of Dreux by his second wife, Perrenelle de Sully.

Question: Who is Joan I, Countess Of Dreux's paternal grandfather?
Answer: John II, Count of Dreux