In 744 , his daughter Bertrada of Laon ( by Bertrada of Cologne ) married Pepin the Short , mayor of the palace of Neustria and Burgundy and later king of the Franks . By 744 , his daughter Bertrada of Laon ( by Bertrada of Cologne ) had married Pepin the Short , mayor of the palace of Neustria and Burgundy and later king of the Franks .