| Name | From | Until | Cause of end of reign | Relationship with predecessor | Primary Holding |
|---|---|---|---|---|---|
| Count Eustache | 6 October, 1084 | was slain by Mayor Hugo of Nieuwpoort in personal combat | Boulogne | ||
| Duke Godefroy ''the Usurper'' | 6 October, 1084 | 9 August, 1096 | died in battle against Bishop | son of Count Eustache | Flanders |
| Duke Valeran | 9 August, 1096 | 1112 | Game Ended | bert of Cambrai of Duke Godefroy | Flanders |