With Geoffrey, Fulk made a donation to the Abbey of Cluny on 26 May 1037 and to Saint Victor at Marseille on 16 January 1040.
Fulk Bertrand was a major proponent of the renewed monasticism of early eleventh-century Provence.
He called together a council of clergy and noblesse to found the abbey of Saint Promasius near Forcalquier and to restore Bremetense near Gap, which had been destroyed by the Saracens of Fraxinetum.
It was mostly parcelled out as allods to vassals and the weakening of the county of Provence as a united polity can be dated from their reign.
He married Hildegard and they had two sons, William Bertrand and Geoffrey II, plus one daughter, Gerberge.