Charlemagne

Charlemagne (pronounced /ˈʃɑrlɨmeɪn/; Latin: for Charles the Great) (747 – 28 January 814) was King of the Franks from 768 to his death. He expanded the Frankish kingdoms into a Frankish Empire that incorporated much of Western and Central Europe. During his reign, he conquered Italy and was crowned Imperator Augustus by Pope Leo III on 25 December 800 as a rival of the Byzantine Emperor in Constantinople. His rule is also associated with the Carolingian Renaissance, a revival of art, religion, and culture through the medium of the Catholic Church. Through his foreign conquests and internal reforms, Charlemagne helped define both Western Europe and the Middle Ages. He is numbered as Charles I in the regnal lists of France, Germany, and the Holy Roman Empire.

In Doctor Who
He is mentioned in DW: The Unicorn and the Wasp