[EggsAckley]

Don't know if this is the one. It IS by Modena, and it IS from the basilica in Bologna, but the site was in Italian.

[Romulus]

The picture you've posted looks like Dante's description of Cocytus, the lowest point in Hell, where a black-haired, winged Satan with three mouths eternally consumes Cassius, Brutus, and Judas. Mohammed is punished not here but (as I recall) among the heretics and sowers of discord.