What you’re looking at here is infamous Roman Emperor Caligula on the left, and infamous Ruler of the Seven Kingdoms Joffrey Baratheon on the right. The resemblance is uncanny, but the two have more in common than just looks, with the young emperor known for his cruelty and sexual perversity during his short, barely four year reign in 37 AD.
I suggest you read about his full history here, and he really does seem like something of an asshole. However, it does take a lot to out-evil Joffrey, who once wanted to serve his ex-girlfriend her family member’s head at his wedding feast. May his reign be just as short on Game of Thrones.