'Daesh' and their associates are the 21st century barbarians:

"They have pillaged the world. When the land has nothing left for men who ravage everything, they scour the sea. If an enemy is rich, they are greedy; if he is poor, they crave glory. Neither East nor West can sate their appetite. They are the only people on earth to covet wealth and poverty with equal craving. They plunder, they butcher, they ravish, and call it by the lying name of 'empire'. They make a desert and call it 'peace'."

Publius Cornelius Tacitus - a historian of the Roman Empire