He was also seigneur (lord) of Rochefort, and advocate of Dinant.
His parents were Lambert, Count of Montaigu and Clermont, and his wife Gertrud.
Godfried married Juliane, daughter of Otto II, Count of Duras, and his wife Berthe of Valenciennes.
They had five children: Upon the death of Godfried, his son Gilles inherited all three counties.
Pierre is also listed as a Count of Montaigu, but as he died before his older brother, it is not clear that he ever actually held the title.