Guillaume de Jumièges names "Richardum et Balduinum" as the two sons of "Gislebertus...filius Godefridi comitis Aucensis". He and his brother are named as sons of Gilbert de Brionne by Orderic Vitalis, recording that they took refuge in Flanders after their father was murdered.
Seigneur de Sap et de Meules, Normandy, after Guillaume II Duke of Normandy restored them to him after being requested to do so by his father-in-law Baudouin V Count of Flanders. Orderic Vitalis names "...Balduinus et Ricardus Gisleberti comitis filii..." among the leading lords under Guillaume II Duke of Normandy. Orderic Vitalis records that William I King of England built a castle within the walls of Exeter, after he suppressed the town's rebellion, and appointed "Balduinum de Molis filium Gisleberti comitis" as custodian, dated to early 1067. After the Norman conquest of England, William I King of England gave Baudouin about 160 lordships in Devon, Dorset and Somerset, among which he became Lord of Okehampton, Devon. "…Halduini [Balduini?] filii comitis Gilberti…" witnessed the charter dated 1082 under which William I King of England granted land at Covenham to the church of St Calais. Sheriff of Devon 1080 to 1086.
The necrology of Saint-Nicaise de Meulan records the death of "Baldoinus filius comitis", undated but listed among deaths recorded in Feb.
Married Alberade, daughter of ---. Orderic Vitalis describes Alberade as the daughter of the amita of William II King of England. The Fundationis et Fundatorum Historia of Forde Abbey records that "dominus Baldewinus de Brionis" married "Albredam neptem domini Willelmi Bastardi…ducis Normanniæ". Her precise parentage has not yet been ascertained. 1
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