The Praetorian Guard were the Roman Empire's version of the SAS or the Navy Seals. If the Emperor told them to go and punch a little girl in the face, they'd do it. If he ordered them to swallow his Feces they'd do it. If he told them to charge a barbarian front line dressed only in a leaf, they'd do it. This shows that the Praetorians were both extremely hard and extremely stupid. The Praetorian Guard protected the person of the Emperor and it was because of them that the likes of Nero, Caligula and Domitian could get away with acting like cunts.