
Aistulf (died 756) was the Duke of Friuli from 744, King of Lombards from 749, and Duke of Spoleto from 751. His father was the Duke Pemmo. After his brother Ratchis became king, Aistulf succeeded him in Friuli. He succeeded him later as king when Ratchis abdicated to a monastery. Aistulf continued the policy of expansion and raids against the pap...
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http://en.wikipedia.org/wiki/Aistulf

(from the article `Papal States`) ...claim of the Byzantine Empire to sovereignty there. This Donation of Pippin (756) provided the basis for the papal claim to temporal power. In the ... The pope was in need of aid. Aistulf, king of the Lombards, had seized Ravenna with its lands, known as the exarchate. Soon, Lombard troops marched .....
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http://www.britannica.com/eb/a-z/a/34
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