The Ten Emperors is a term named during the Post-Devil's Civil Wars era, where the promotions of uses of Evil Pieces were introduced. As the Rating Games & Evil Pieces were introduced, there were interview to describe the top 10 strongest young devils of their generation. They all possess extraordinary powers and abilities, making them all runner-ups to become important figures and models in the Underworld Society. Some are also considered to become the next generation of Satans as well. As is the case, they are regarded as mix of "prodigies" and also "problem children" due to their unique personalities who doesn't share the view of the old ways. They appeared between the end of the Conflicting Age of Three Factions and the beginning of the Age of Three Factions Alliance.