Robert I the Friesian of Flanders, Count of Flanders, was born circa 1032 to Baldwin V of Flanders (1012-1067) and Adèle of France (1009-1079) and died 13 October 1093 Kassel of unspecified causes. He married Gertrud von Sachsen (1033-1113) . Hugh Capet (c940-996), Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Rollo of Normandy (860-932)/s.
Robert was regent of Holland for his step-son Dirk
|Offspring of Robert I of Flanders and Gertrud von Sachsen (1033-1113)|
|Robert II 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) Canute IV of Denmark (c1043-1086) Roger Borsa (c1060-1111)|
|Gertrude of Flanders (?-?)||1080||1117||Henri III de Louvain (c1063-1095) 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|