Pepin III Syllabification: (Pe·pin III)Pronunciation: /ˈpepin/Entry from US DictionaryDefinition of Pepin III (circa 714–768) king of the Franks 751–768; called Pepin the Short; father of Charlemagne. He founded the Carolingian dynasty in 751. Pepin III in other Oxford dictionaries Definition of Pepin III in the US English dictionary