Original: As he was named for his grandfather , Pepin of Heristal , in turn named for his grandfather , Pepin of Landen , both mayors of the palace , Pepin the Short has sometimes been numbered Pepin III . Pepin 's father Charles Martel died in 741 .
Simplified: Pepin the Short or Pippin ( 714 â '' September 24 , 768 ) , often known as Pepin the Younger or Pepin III , was King of the Franks from 751 to 768 .