Charles Martels legacy
Though Charles Martel, being not king but only chancellor, never cared about titles, his son Pippin did, and
finally asked the Pope
The Pope, highly dependent on Frankish armies for his
independence from Lombard and Byzantine power ( the Byzantine Emperor
still considered himself to be the only legitimate "Roman Emperor", and thus,
ruler of all of the provinces of the ancient empire, whether recognised or not ),
Decades later, in 800, Pippin's son Charlemagne was crowned emperor by the Pope, further extending the principle by delegitimising the nominal authority of the Byzantine Emperor in the Italian peninsula, thus paving the way for the Frankish empire.