I didn't know about Dante's Inferno (from the Divine Comedy), but I just read that the 4 emperors from FF4 are names from the book. I gotta buy it!
After some searching, I found out the names:
Scarmiglione (canto 21)
Cagnazzo (canto 21 and 22)
Rubicante (canto 21 and 22)
Barbariccia (canto 21 and 22)
If this is the right answer, abrojtm had it first. I only divulged my findings in case someone would be interrested, and for informal/educational purposes.
