Eustache I de Boulogne was born circa 995 to Baudouin de Boulogne (-1033) and Adelina van Holland (990-1045) (.nl) and died 1049 of unspecified causes. He married Mahaut de Louvain (c1001-c1049) .
Children
| Name | Birth | Death | Joined with |
| Eustache II de Boulogne (?-1087) | 1017 | 1087 | Goda of England (1004-1055) Ide de Verdun (c1040-1113) |
| Ida de Boulogne (?-?) | |||
| Godefroy de Boulogne (?-1095) | 1095 | ||
| Lambert II de Lens (?-1054) | 1054 | Adelaide of Normandy (c1026-c1090) | |
| Gerberge de Boulogne (?-1049) | 1049 | Friedrich von Luxemburg (1003-1065) | |
Footnotes (including sources)
| ‡ General |