Was the cradle of civilization also the birthplace of atrocity? Historians have been researching the most extreme forms of torture in the ancient world. Among other things, they have found that, back then, "sitting in the tub" was actually a pretty nasty way to kick the bucket.

In total, Julius Caesar reckoned that he had 1,192,000 enemies killed during his reign. Meanwhile the Emperor Tiberius would have young men's urethras laced shut before force-feeding them wine. And, under Caligula, it became customary to saw noblemen in half.

It sounds bad -- but were these the cruellest of them all? Would they qualify for the barbarity top 10?