Pepin III vs Pepin the Short

Pepin III and Pepin the Short both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pepin III	Yes	No	No	No
Pepin the Short	Yes	No	No	No

As nouns, Pepin III and Pepin the Short are synonyms defined as:

Pepin III and Pepin the Short: king of the Franks and father of Charlemagne who defended papal interests and founded the Carolingian dynasty in 751 (714-768)

Other synonyms of Pepin III include Pepin.

Pepin III (noun)	Pepin the Short (noun)
king of the Franks and father of Charlemagne who defended papal interests and founded the Carolingian dynasty in 751 (714-768)	king of the Franks and father of Charlemagne who defended papal interests and founded the Carolingian dynasty in 751 (714-768)