Guy II (sometimes III) (died late 882 or early 883) was the eldest son and successor of Lambert I as Duke of Spoleto and Margrave of Camerino.
John responded by begging the aid of Charles the Fat, already King of Italy, and crowning him Emperor on 12 February 881.
A papal letter dated 11 November and addressed to Charles referred to Guy as Rabbia, an epithet meaning "rage."
As ruler, Guy used the motto Renovatio regni Francorum (renewing the kingdom of the Franks), like his Carolingian predecessors.
Guy never succeeded in his dreams of expansion or in keeping his promises: he died young, later that year or early in the next.