|From the new series of Horrible Histories comes the Rotten Rulers giving you the lowdown on the world's most loathsome leaders. From bizarre tsars and evil emperors to crazy kings and queens, people all around the world have suffered at the hands of their rulers for centuries. Whether they're nutty or nasty, fat or foul, those in charge rarely get it right. Read on for the power-crazed president who still rules from the grave and find out about the suffering slave who was ordered to collect 500 kilos of spider webs for his boss. Meet Genghis the Mongolian murderer and discover just how terrible Ivan really was. History has never been so horrible!