Gilbert (Giselbert), Count of Maasgau was a Frankish noble in what would become Lotharingia, during his lifetime in the 9th century.
The Carolingian dynasty created this "middle kingdom" and fought over it, and he is mentioned as playing a role on both sides.
A Count Gilbert was mentioned in some later records from this time: In 880, the Treaty of Ribemont conceded all of Lotharingia to be once again under the eastern Frankish kingdom ("Germany").
Mansuaria has been given various explanations, which note that the spelling "Masuarinsis" (without "n") is found in another medieval document, the Gesta of the Abbey of St Truiden, which was describing places near modern Diest.
[9] Another possibility is that he was related to a man named Reginar, son of Meginhere (a nobleman from the court of Charlemagne).