(Canto 16, line 70-71)
This Guglielmo does not figure in historical works, but ancient commentators all describe him as a man of a generous and unbound spirit. Boccaccio even mentions him as a "knight", and he is supposed to have been famous for eloquence and diplomatic skill. In the Decameron, he figures "censuring avarice" in a merchant of Genoa. He may have died in 1300, prompting the comment "with us of late".