Pepin of Herstal
After the reign of Dagobert I (629–639) the Merovingians effectively ceded power to the Pippinid Mayors of the Palace, who ruled the Frankish realm of Austrasia in all but name. They controlled the royal treasury, dispensed patronage, and granted land and privileges in the name of the figurehead king. Charles' father, Pepin of Herstal, was able to unite the Frankish realm by conquering Neustria and Burgundy. Pepin was the first to call himself Duke and Prince of the Franks, a title later taken up by Charles.