• Born: Abt 1012, Flandres
• Married: 1028, Amiens, Somme, Picardy, France
• Died: 1 Sep 1067, Lille, Nord, Nord-Pas-de-Calais, France
• Buried: Lille, Nord, Nord-Pas-de-Calais, France

  Research Notes:

The Genealogica Comitum Flandriæ Bertiniana names "Balduinum Insulanum" as son of "Balduinum Barbatum [et] Odgivam". After 1028, he led a rebellion against his father who was forced to take refuge in Normandy. After his father returned with reinforcements, Baudouin submitted but was allowed to rule jointly.

He succeeded his father in 1035 as BAUDOUIN V "le Pieux/Insulanus" Count of Flanders. He acquired overlordship of the county of Lens from the counts of Boulogne. The Liber traditionum of Gant Saint-Pierre commemorates the donations of "Baldwinus junior marchysus filius Baldwini marchysi et Odgevæ comitissæ cum conjuge sua Adala", undated. He took part in the Lotharingian rebellion against Emperor Heinrich III and sacked the imperial palace at Nijmegen. Emperor Heinrich gathered a large army to wreak revenge in 1049, but in practical terms the only loss to Flanders was the march of Antwerp. Count Baudouin returned Valenciennes to Hainaut, and thus indirectly to German suzerainty. He maintained close relations with Godwin Earl of Wessex, first sheltering the latter´s son Svein after he was outlawed in 1049, then Earl Godwin himself when he was exiled from England in 1051. Emperor Heinrich III invaded Flanders again in 1054 but had to retreat. On the death of Henri I King of France in 1060, Count Baudouin became regent of France for his nephew King Philippe I.

The Annales Blandinienses record the death in 1067 of "Baldwinus potentissimus marchisus". ²