Charibert of Laon
Charibert, Count of Laon, was the maternal grandfather of Charlemagne. He was the father of Charles's mother, Bertrada of Laon. Only his mother is known from contemporary records. In 721, Charibert signed, with his mother Bertrada of Prüm the foundation act of the Abbey of Prüm. The same year, also with his mother, he made a donation to the Abbey of Echternach.