Lupus ruled the Duchy of Spoleto from 745 to 751. He was relatively independent of royal authority.
He made many donations to the Abbey of Farfa and had a close relationship with Abbot Fulcoald. On his death, the duchy was probably seized by Aistulf and then granted to one Unnolf for a brief spell.
- ^ Richard Hodges, Light in the Dark Ages: The Rise and Fall of San Vincenzo Al Volturno (Cornell University Press, 1997), p. 27.