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Gertrud Billung von Sachsen was born 1033 in Schweinfurt to Bernhard II von Sachsen (990-1059) and Eilika von Schweinfurt (1000-1059) and died 4 August 1113 Veurne of unspecified causes. She married Floris I van Holland (1030-1061) 1050 JL . She married Robert I of Flanders (c1032-1093) 1063 JL .
Children
| Name | Birth | Death | Joined with |
| Adelheid van Holland (1045-1085) | 1045 | 1085 | Baudouin de Guines (c1038-aft1091) |
| Albert van Holland (1051-c1098) | 1051 | 1098 | |
| Pieter van Holland (1053-c1101) | 1053 | 1101 | |
| Dirk V van Holland (1054-1091) | 1045 | Othelhildis von Sachsen (1059-?) | |
| Floris van Holland (c1055-c1103) | 1055 | 1103 | |
| Machteld van Holland (c1057-?) | |||
| Bertha van Holland (c1058-1094) | 1058 | 30 July 1093 Montreuil-sur-Mer, France | Philip I of France (1052-1108) |
| Name | Birth | Death | Joined with |
| Robert II, Count of Flanders (c1065-1111) | 1065 | 5 October 1111 Kassel | Clemence de Bourgogne (1078-1129) |
| Adela of Flanders (?-1115) | 1064 | April 1115 | Canute IV of Denmark (c1043-1086) Roger Borsa (c1060-1111) |
| Gertrude of Flanders (?-?) | 1080 | 1117 | Henri III de Louvain (c1063-1095) Dirk II de Lorraine (c1050-1115) |
| Philip van Loo (aft1065-bef1127) | 1065 | 1127 | |
| Ogiva de Messines (c1070-c1117) | 1070 | 1117 | |
{{notable family}
Footnotes (including sources)
| ‡ General |
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