Wikipedia
Supponids
The Supponids were a Frankish noble family of prominence in the Carolingian regnum Italicum in the ninth century. They were descended from Suppo I, who appeared for the first time in 817 as a strong ally of the Emperor Louis the Pious. He and his descendants were on and off dukes of Spoleto, commonly in opposition to the Guideschi clan, another Frankish family powerful in central Italy.