Robert de Harcourt was born circa 1034 in Normandy, France to Anchitil de Harcourt (c1005-) and Eve de Boessey-le-Chapel (c1010-) and died after 1100 of unspecified causes. He married Colette d'Argouges .
Collins's peerage of England; genealogical, biographical, and historical, Volume 4 by Arthur Collins, Sir Egerton Brydges
"Robert de Harcourt, second son, before mentioned, surnamed the Strong, built the castle of Harcourtl and also, with his elder brother Errand, attended William Duke of Normandy in his expedition to England, A.D. 1066. This Robert married Colede D'Argouges, and by her had seven sons. 1. William, of whom mare at large hereafter. 2. Richard de Harcourt, who founded the commandery of St. Stephen at Reneville, became a Knight Templar, Grand Prior of France, and was buried at St. Stephen's aforesaid. 3. Philip de Harcourt, who was Dean of Lincoln, Archdeachon of York, nominated to the bishopric of Salisbury, and appointed Bishop of Bayeaux, where he was buried A.D. 1163. 4. Henry de Harcourt. 5. Baldwin de Harcourt. 6. Errand de Harcourt. And 7. Rollo de Harcourt, who settled in England; and by his wife, Roesia, sister and coheir to William, son of Pain Peverell, Lord of Brunne, and Standard-bearer to Robert Curtois (eldest son of William the Conquerer), in the Holy Land, was father of an only child, Albreda, the wife of Sir William Tursbut, of Yorkshire."
Children
| Name | Birth | Death | Joined with |
| William de Harcourt (c1100-c1148) | 1100 Normandy, France | 1148 England | Agnes d'Ambroise (-c1141) |
| Richard de Harcourt | |||
| Philip de Harcourt (-1163) | |||
| Henry de Harcourt | |||
| Baldwin de Harcourt | |||
| Errand de Harcourt | |||
| Rollo de Harcourt | |||
Siblings
| Name | Birth | Death | Joined with |
| Errand de Harcourt | |||
| Robert de Harcourt (c1034-aft1100) | 1034 Normandy, France | 1100 | Colette d'Argouges |
| John de Harcourt | |||
| Arnold de Harcourt (-c1068) | |||
| Gervase de Harcourt | |||
| Ivo de Harcourt | |||
| Renauld de Harcourt | |||
| Agnes de Harcourt | |||