Dante?
"As shown by the artwork above, the Middle Ages also viewed Islam has a heresy. In Dante’s Inferno, Canto XXVIII, Muhammad is depicted as “twixt the legs, Dangling his entrails hung, the midriff lay Open to view…” Muhammad suffers the punishment of the schismatics: having his body rent from chin to anus for how he rent the Body of Christ. ..."
He was saying something about this and to read Dante.