Gilbert (Giselbert), Count of Maasgau, was a vassal of Charles the Bald. He was count of Maasgau on the lower Meuse. Gilbert's background is not known. The similarity of his son's name to the name "Ragnar" has been used as an argument to suggest a Viking connection. Another possibility is that he was related to a man named Reginar, son of Meginhere (a nobleman from the court of Charlemagne). Children may include: * Reginar, Duke of Lorraine (c. 850–916). There is no primary source unequivocally stating that Reginar was Gilbert's son. * Albert is mentioned as a brother of Reginar.